JPS6158864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information reading device that uses one reading system to read optical information written on both the front and back sides of a form.

Conventionally, when reading optical information written on both the front and back sides of a form, two reading systems are required from the light source to the reading element, which is complicated, large and expensive. , different read sensitivities require separate gain adjustments.

An object of the present invention is to provide an optical information reading device that uses one reading system to read optical information written on both the front and back sides of a form.

In order to achieve the above object, the optical information reading device of the present invention is an optical information reading device that optically reads information written on a form. , the form
A second reading position is set to read the back side by rotating the second reading position by 180 degrees, and the reading reflected light from each reading position is emitted in a 45-degree direction with respect to the line segment connecting the two reading positions. It is characterized in that when the reflected reading lights are reflected by mirrors in the right angle direction, the reflected reading lights from both reading positions are made to have the same optical axis and are made to enter the reading element with the same optical path length. It is.

Hereinafter, the present invention will be explained in detail with reference to examples.

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. This figure shows the travel path of the form in the optical information reading device. That is, the forms 10 accumulated in the hopper 1 are sent one by one to the path 4 by the pick roller 2 and the feed roller 3, the information on the surface of the forms 10 is read at point A, and then it is turned 180 degrees and moved to point B. After reading the information on the back side of the form 10', it is stored in the stacker. In order to read the information at both points A and B with almost equal sensitivity with one reading element 16, the information at both points A and B is read from the forms 10 and 10'.
It is irradiated by light sources 11 and 12 arranged in a 45-degree direction, and the reading reflected light is emitted in a 45-degree direction with respect to the line segment AB connecting both points A and B, and these emitted reading reflected lights are Mirror 13 placed high,
When the light is reflected by the light beam 14 in the right angle direction, both optical axes coincide with each other, enter the lens 15 , are focused, and enter the reading element 16 . Since the reading points at point A and B are different, the mirror 14 is controlled to be pulled upward as shown by the dotted line while the reading reflected light passes from point A through mirror 13.

In this case, as shown in the figure, the movement path 4 of the form is
If C is the intersection of the optical path of the reading reflected light from point B, then CB=CA=a, which means that mirror 13,
Equal to the distance between 14. And mirrors 13 and 14
If the height of both is b, from point A to mirror 13
The optical path length from point B to mirror 14 is equal to the optical path length from point B to mirror 14, which is a+b in both cases.

Therefore, since the reading reflected light from points A and B enters the reading element 16 with the same optical axis and the same optical path length,
Thereafter, only one reading system such as a detection circuit is required, and the adjustment of the amplification gain may be the same. This is a traditional surface,
Although two back side reading systems are provided, the configuration and adjustment are significantly simplified.

FIG. 3 is an explanatory diagram showing the configuration of another embodiment of the present invention. In the figure, the relative positional relationship between the front side reading position A and the back side reading position B in the travel path 4 of the form is arranged vertically. In this case, since the reading reflected light optical system as shown in FIG. 1 cannot be applied, the light sources 11 and 12 are
0 and 10', emitted in a 45-degree direction, reflected by mirrors 13 and 14 at right angles, aligned optical axes, focused through lens 15, and incident on reading element 16. . This is the first
This is equivalent to rotating the figure in the figure by 45 degrees.

In this case, both points A and B incident on the reading element 16
As in FIG. 1, the optical axes of the reading reflected light from the two sides coincide and the optical path lengths are equal.

As explained above, according to the present invention, when reading information on the front side of a form and then rotating it 180 degrees to read information on the back side, each reading reflected light is reflected in a right angle direction by a mirror to align the optical axes. At the same time, the optical path lengths are made equal and the beams are made incident on the reading element. As a result, only one reading system is required after the reading element, and adjustment of the same amplification gain is sufficient, so the configuration and adjustment can be greatly simplified and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is an explanatory diagram showing the configuration of another embodiment of the present invention, in which 1 is a hopper, 2 is a pick crawler,
3 is a feed roller, 10, 10' is a form, 11, 1
2 is a light source, 13 and 14 are mirrors, 15 is a lens,
16 indicates a reading element.

Claims (1)

[Claims] 1. In an optical information reading device that optically reads information written on a form, there is a first reading position that reads the surface of the information written on the form, and a first reading position that reads the information written on the form.
A second reading position is set for reading the back side by rotating the reading position, and the reading reflected light from each reading position is emitted in a 45-degree direction with respect to the line segment connecting both reading positions. Optical information characterized in that when each reflected light is reflected in a right angle direction by a mirror, the read reflected light from both reading positions are made to have the same optical axis and are made to enter the reading element with the same optical path length. reading device.