JPH069286Y2 - Document size detector for copiers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a document size detecting device for a copying machine that optically detects a document size of the copying machine.

<Outline of the Invention> In order to eliminate the influence of the reflected light on the surface of the transparent cover, the document size detection device of the copying machine of the present invention does not arrange the light emitting element and the light receiving element substantially perpendicular to the transparent cover, and Both of them are juxtaposed in close proximity to each other, and are arranged in the same direction with respect to the transparent cover with inclination angles.

<Prior Art> Conventionally, a device for optically detecting the presence or absence of an object is roughly classified into a transmissive type device for detecting an object passing between the light emitting and light receiving elements opposed to each other at a certain interval.
There is a reflection type device in which light-emitting and light-receiving elements are arranged side by side and light from the light-emitting element is reflected by an object to be detected by the light-receiving element.

For example, a general structure of a document size detecting device of a copying machine is equipped with a transparent glass (transparent cover) on the front surface of the document,
There are a light-emitting / light-receiving element pair that is juxtaposed in close proximity to each other and arranged vertically to a transparent glass surface, or a light-emitting / light-receiving element that is arranged at a certain angle with a predetermined interval.

<Problems to be solved by the invention> However, in the above-mentioned conventional document size detection device,
This is difficult to apply to a copying machine in which the space for arranging the light-receiving elements is extremely limited, and a structure in which light-emitting / light-receiving element pairs that are juxtaposed in close proximity are arranged perpendicular to the transparent glass surface Then, the detection margin is low because the glass surface is easily affected by the reflected light.

<Means for Solving Problems> The present invention has been made in view of the above circumstances, and includes a printed circuit board arranged below the transparent cover on which a document is placed and parallel to the transparent cover. A case having a bottom portion fixed on the printed circuit board, two bottom through holes that are close to each other and are inclined in substantially the same direction are provided in the bottom portion of the case, and the transparent cover is exposed to light. A light emitting element that emits light and a light receiving element that receives reflected light from the original are connected to the printed circuit board, respectively, and the light emitting element and the light receiving element are inserted and fixed in the through holes, respectively, and the transparent cover is attached. On the other hand, it is characterized in that they are arranged in substantially the same direction with inclination angles.

<Operation> With the above structure, the present invention arranges the light emitting element and the light receiving element juxtaposed in close proximity to each other with a tilt angle in substantially the same direction with respect to the transparent cover on which the original is placed. The influence of reflected light from the surface can be eliminated, and an object with a high detection margin can be detected. In addition, since it is not necessary to incline the case on the printed circuit board arranged in parallel with the transparent cover, the case can be accommodated within a relatively limited range without taking up space.

Further, the arrangement of both elements is performed by inserting and fixing each element into the through hole of the case and fixing the case on the printed circuit board, and the positioning can be performed easily and surely.

<Embodiment> Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view for explaining the principle of a document size detecting device for a copying machine according to the present invention.

The light emitting element 1 and the light receiving element 2 are accommodated side by side in the case 3 with their angles slightly changed. Also these light emission
The light receiving element pairs 1 and 2 are arranged below the glass plate 5 which is a transparent cover provided on the front surface of the original 4 with an inclination angle in substantially the same direction with respect to the glass plate 5, and the inclination angle is the same as that of the glass plate. Angle θ from the vertical direction of the plate 5 surface
(Normally, θ is preferably about 10 ° to 20 °).

With the above configuration, most of the light A from the light emitting element 1 is divided into light a1 reflected on the surface of the glass plate 5 and light a2 passing through the glass plate 5 when there is no document. Therefore, the light emitted from the light emitting element 1 hardly enters the light receiving element 2. If there is an original, the glass transmitted light a
2 is almost eliminated, and the original 4 causes irregular reflection light. Since a part a3 of this irregularly reflected light enters the light receiving element 2, the document can be detected.

FIG. 2 shows an essential part of a document size detecting device for a copying machine according to an embodiment of the present invention. As shown in FIG. 2, it has a printed circuit board 5 arranged in parallel below the transparent cover on which a document is placed, and a case 6 whose bottom portion is fixed on the printed circuit board 5. , Two through-holes 6 close to each other on the bottom surface of the case 6 and inclined in substantially the same direction.
a and 6b are provided, a light emitting element 1 that emits light to the transparent cover and a light receiving element 2 that receives reflected light from the original are connected to the printed circuit board 5, respectively, and the through hole 6a is formed. , 6b, the light emitting element 1 and the light receiving element 2 are inserted and fixed, respectively, and are arranged in substantially the same direction with respect to the transparent cover with inclination angles.

As described above, the light emitting element 1 and the light receiving element 2 which are juxtaposed in close proximity to each other are arranged at an inclination angle in the substantially same direction with respect to the transparent cover 5 on which the original 4 is placed. The influence of the reflected light can be eliminated, and an object with a high detection margin can be detected. Further, since it is not necessary to incline the case 6 on the printed circuit board 5 arranged in parallel with the transparent cover, the case 6 can be accommodated within a relatively limited range without taking up space.

Further, the arrangement of both the elements 1 and 2 is only required to insert and fix the elements 1 and 2 into the through holes 6a and 6b of the case 6, and fix the case 6 on the printed circuit board, and the positioning is easy. And it can be fixed securely.

FIG. 3 shows a structural example of a case used in the present invention, (a)
Is a top view, (b) is a front sectional view, and (c) is a bottom view. Reference numeral 7 is a case, 7a and 7b are through-holes capable of setting light emitting / receiving elements at arbitrary angles, and 7c is a convex portion for fixing each element. In this example, the through hole 7a for fixing the light emitting element 1 has an inclination angle of 20 ° from the vertical direction, and the through hole 7b for fixing the light receiving element 2 is formed.
Is configured with an inclination angle of 10 ° from the vertical direction.

An optical filter 8 may be arranged on the light receiving side on the upper surface of the case 7 as shown in FIG.

Further, in the structure of the above case, the inclination angles of the light emitting element and the light receiving element can be arbitrarily set, and the respective elements may be arranged in parallel in the same direction without changing the angle.

<Advantages of the Invention> As described above, according to the present invention, in the document size detecting device of the copying machine, the light emitting element and the light receiving element are arranged in close proximity to each other, and are inclined in substantially the same direction with respect to the transparent cover. Due to the structure arranged at an angle, it is possible to provide a document size detection device for a copying machine which has a relatively high detection margin without taking up space.

Further, the arrangement of both elements is performed by inserting and fixing each element into the through hole of the case and fixing the case on the printed board, and the positioning can be performed easily and surely.

[Brief description of drawings]

FIG. 1 is a schematic view for explaining the principle of the present invention, FIG. 2 is a sectional view of an essential part of a document size detecting device of a copying machine according to an embodiment of the present invention, and FIG. 3 is a case used for the present invention. A structural example is shown, (a) is a top view, (b) is a front sectional view, (c)
FIG. 4 is a bottom view and FIG. 4 is a top view of the case of FIG. 3 provided with an optical filter. 1 ... Light emitting element, 2 ... Light receiving element, 3, 6, 7 ... Case, 6
a, 6b, 7a, 7b ... through holes.

Claims (1)

[Scope of utility model registration request] 1. A bottom surface of a case having a printed board arranged in parallel with the transparent cover on which an original is placed, and a case having a bottom portion fixed on the printed board. The portion is provided with two through-holes which are close to each other and are inclined in substantially the same direction, and each has a light-emitting element that emits light to the transparent cover and a light-receiving element that receives reflected light from the document. A copy, characterized in that it is connected to the printed circuit board, the light emitting element and the light receiving element are inserted and fixed in the through holes, respectively, and arranged in the same direction with respect to the transparent cover with inclination angles. Document size detection device.