JPH0376463A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To obtain an optical length to be required even within a limited space by arranging two reflecting mirrors between an original and a lens symmetrically in the horizontal direction while the mirrors are placed opposite to each other in the truncated chevron with respect to their imaginary line at a tilt angle of alpha deg.. CONSTITUTION:Two reflecting mirrors 4a, 4b are arranged between a read line A of an original 1 and a lines 3 of a CCD 2 symmetrically in the horizontal direction while the mirror are placed opposite to each other as a truncated chevron with respect to their imaginary line X at a tilt angle of alpha deg.. Then the incident angle from the original 1 along the read line A into the reflecting mirror 4a is selected as 90 deg.-3alpha deg.. Thus, the light is reflected four times between the two reflecting mirrors 4a, 4b. Thus, the required optical length is obtained within a limited space.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a facsimile machine, and more specifically, a document is reduced in size with a lens and the image is transferred to an image pickup device (CCO).
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[Conventional technology]

In a facsimile machine that uses a COD as an image sensor, a lens is used to reduce the size of the reading line and form an image on the CCD.

In that case, in order to form an image on the CCD without distorting the image, it is necessary to lengthen the optical path length between the original and one lens. In addition, in order to absorb the positional shift of the document by the depth of focus, it is better to lengthen the optical path length. However, simply increasing the optical path length linearly increases the size of the entire apparatus, which is undesirable.

Therefore, in the past, as shown in Figure 2,
Two reflecting mirrors 4a and 4b are arranged between the original 1 to be read and the lens 3 of the CCD 2, and the optical path from the original 1 to the lens 3 is bent to ensure the necessary optical path length in a narrow space. Teru.

[Problem to be solved by the invention]

In order to fit the reading section of the document 1 and the CCD 2 into a narrower space, it would be possible to increase the number of reflecting mirrors, but this would increase the cost and make the reflection more complicated, making it difficult to design. This will place an extra burden on you.

[Means to solve the problem]

In order to solve the above-mentioned problems, in the present invention, in a facsimile machine that reduces a document with a lens and reads its image with an image sensor, two reflecting mirrors are installed between the document and the lens. They are arranged symmetrically to the right so that they face each other in a V-shape with each tilted at α degrees with respect to the center line, and the angle of incidence from the 5M draft to one of the mirrors is 9.
The angle is 0 degrees - 3α degrees, and the light from the original is reflected four times between two reflecting mirrors and directed toward the lens.

[For production]

If two reflecting mirrors are arranged as above and the angle of incidence from the original to one reflecting mirror is 90 degrees - 3α degrees, then the second
The optical path between the first reflection and the third reflection is perpendicular to the virtual center line, a symmetrical optical path is created between these reflecting mirrors, and four reflections are performed between the two mirrors.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, this facsimile machine has two reflecting mirrors 4a between the reading line A of the original 1 and the lens 3 of the CCD 2, as in the conventional facsimile machine.

4b, but in this case, the reflecting mirror 4a.

4b are respectively α with respect to the virtual center line X between them.
They are arranged symmetrically to the right so that they face each other in a V-shape with an inclination of 50 degrees. Then, the angle of incidence from the reading line A of the manuscript editor to one of the reflecting mirrors 4a is set to 90@-3α.
°.

That is, the light from the reading line A is incident on one reflecting mirror 4a with an incident angle of 90°-3α°, and is reflected at point B of the same reflecting mirror 4a toward the 0 point of the other reflecting mirror 4b. Since there is a relative inclination of 2α0 between both reflecting mirrors 4a and 4b, the incident angle at the 0 point is 90''-α°. Therefore, from this 0 point to the D point of one reflecting mirror 4a. The optical path toward the lens is orthogonal to the virtual center line X, and the incident angle at point D is 90°-α°. The optical path leading to point F in No. 3 is symmetrical with the optical path leading from point A to point B to point C, and in this way, the light can be reflected four times between the two reflecting mirrors 4a and 4b. Therefore, the required optical path length can be obtained in a limited space.

By the way, after securing the necessary optical path length,
We were able to shorten the distance between 276 towers to 96 am+.

〔Effect of the invention〕

As described above, according to the present invention, the required optical path length can be obtained within a limited space without increasing the number of reflecting mirrors, so that the device can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the present invention, and FIG. 2 is a schematic diagram showing a conventional example. In the figure, 1 is a document, 2 is an imaging device (CCO), 3 is a lens, and 4a and 4b are reflecting mirrors. Figure 1 Figure 2

Claims (1)

[Claims] (1) In a facsimile machine that reduces the size of a document with a lens and reads its image with an image sensor, two reflecting mirrors are placed between the document and the lens, each having an angle α to the virtual center line between them. Arranged symmetrically to the right so that they face each other in a V-shape with a degree of inclination,
A facsimile apparatus characterized in that the incident angle from the original document to the one reflecting mirror is 90 degrees - 3α degrees, and the light from the original document is reflected four times between the two reflecting mirrors and directed toward the lens. .