KR100334446B1 - Medium detecting device - Google Patents

Abstract

In a medium detecting device having a prism that reflects light of a light emitting element and guides it to a light receiving element, the influence of a blot and external light of the prism is protected.

Install case 17 to cover around prism 10.

The case 17 may be integrated with the prism 10 or may be different.

The height of case 17 is higher than prism 10.

Description

Medium detection device {MEDIUM DETECTING DEVICE}

The present invention relates to a medium detecting device that optically detects a medium conveyed on a conveying path. In particular, a light emitting element and a light receiving element receiving light are on the same side of the conveying path, and a reflector reflecting light is provided on the opposite side of the conveying path. The present invention relates to a medium detecting device.

Conventionally, an apparatus for optically detecting a carrier medium has a light path and a light receiving element disposed on both sides of a carrier path for conveying a medium, so that light from the light emitting element is received by the light receiving element through the transport path.

When the medium is conveyed in the conveyance path, the medium blocks light emitted from the light emitting element so that light does not reach the light receiving element, thereby detecting the conveyance of the medium.

In the detection apparatus, for example, when detecting the meandering (skew) of the medium, the medium must be detected at two places, so two pairs of light emitting elements and light receiving elements must be provided.

In short, the number of elements increases and the circuit or the connection cord becomes complicated with the increase in the number thereof.

In order to cope with such a situation, even when a prism as a reflector is provided and meander is detected, there is a pair of light emitting elements and light receiving elements.

However, in the conventional detection apparatus, there is also a problem in that the prism reflecting light is easily exposed to the influence of external dimming.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a first reflecting surface and a first reflecting surface having a light emitting element and a light receiving element on one side of a conveying path for carrying a medium and reflecting light from the light emitting element on the opposite side of the conveying path. A peripheral member surrounding the first and second reflecting surfaces of the reflector is provided in the medium detecting device so as to have a reflector having a second reflecting surface reflecting light from the reflecting surface of the light reflecting element toward the light receiving element. It is a feature.

In addition, the peripheral member may be configured to block extraneous light or may be provided with a cover member which is attached to the peripheral member and covers at least the first and second reflective surfaces of the reflector.

According to the present invention having the above constitution, by installing the peripheral member, the reflector does not become dirty because the finger or the like does not touch even during the inspection. In addition, it is possible to prevent the peripheral member from being affected by the disturbance light by blocking the disturbance light.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, the Example which concerns on this invention is described according to drawing.

Elements common to each drawing are also given the same reference numerals.

1 is a perspective view showing a medium detecting device of a first embodiment according to the present invention;

2 is a side sectional view showing the medium detecting apparatus of the first embodiment, and the first embodiment will be described with reference to both figures.

In both drawings, the conveying path 2 of the medium 1 is formed by the conveying guides 3 and 4 above and below.

The upper and lower conveyance guides 3 and 4 are secured at a predetermined interval and are supported in the horizontal direction.

In the upper conveyance guide 3, circular holes 5 and 6 are formed so that the light emitting element 7 and the light receiving element 8 penetrate into the hole from the top.

The light emitting element 7 is composed of a light emitting diode, and the light receiving element 8 is composed of a photo transistor, and is mounted on a printed board 9 together.

The prism 10 is provided in the lower conveyance guide 4.

The prism 10 is made of a material having a high refractive index, for example, glass or optically transparent resin, and has a cylindrical protrusion shape that emits light to the light incidence part 11 and the light receiving element 8 of the cylindrical protrusion which receives light from the light emitting element 7. It has a light exit 12.

The prism 10 has a first reflecting surface 13 reflecting light coming straight from the light emitting element 7 in the horizontal direction and a second reflecting surface 14 reflecting light from the first reflecting surface 13 in the light receiving element 8 direction.

As shown in FIG. 2, the tip ends of the light incident part 11 and the light exit part 12 are subjected to return quality or R finishing, so that the light incident part 11 and the light exit part 12 are inserted into the holes 15, 16 of the lower half speed guide 4, and the prism 10 This is installed.

The light incident part 11 and the light exit part 12 do not protrude in the conveyance path 2 in the holes 15 and 16 as shown in FIG.

The case 17 is integrally formed with the prism 10 so as to surround the prism 10. As shown in FIG. 2, the height L ₁ of the case 17 is higher than the height L ₂ of the prism 10, and disturbance light is less likely to enter the first and second reflection surfaces 13 and 14 of the prism 10.

On the outside of the case 17, the projection 18 for attaching the case 17 to a mounting member (not shown) is formed.

In FIG. 2, a connector 19 is actually provided on the printed board 9 and is connected to a driving circuit (not shown) through the cord 20. In FIG.

Next, the operation of the first embodiment will be described.

Light emitted from the light emitting element 7 exits the hole 5 of the conveyance guide 3, passes through the conveying path 2, and enters the prism 16 in the light incident part 11 to reach the first reflecting surface 13.

Here, the light is reflected to be in the check direction to reach the second reflecting surface 14, and here again it is reflected in the light receiving element 8 direction.

The light reflected from the second reflecting surface 14 exits the prism 10 from the light exiting part 12, passes through the conveying path 2, exits the hole 6 of the conveying guide 3, and enters the light receiving element 8.

Such light emission is performed to detect the half-sintered state of the medium 1 in half the furnace 2.

That is, when the medium 1 is conveyed and passes between the light emitting element 7 or the light receiving element 8 and the prism 10, the amount of light of the light emitting element 7 is attenuated by this, and the amount of light received by the light receiving element 8 changes.

The presence or absence of medium 1 is detected by measuring the change in the light receiving amount of the light receiving element 8, and the particle size hole of the medium 1 detects the conveyance speed or the like by measuring the change accompanying the passage of the light receiving amount.

At this time, since the case 17 is formed around the prism 10, disturbance light does not easily enter the first and second reflection surfaces 13 and 14 of the prism 10, and the change in the amount of light can be detected accurately.

In the above embodiment, the prism 10 and the case 17 are integrally formed, but may be integrally formed.

However, when the prism 10 and the case 17 are formed of the same material, the cost is reduced at once.

In addition, when case 17 is formed from the light-shielding colored material, it does not necessarily need to match.

As described above, according to the first embodiment, by installing the case 17 around the prism 10, it is difficult for a finger or the like to come into contact with the first and second reflective surfaces 13 and 14 during assembly or inspection, thereby preventing contamination.

In addition, since the height of the case 17 is higher than that of the prism 10, the influence of the disturbance light on the first and second reflection surfaces 13 and 14 is lessened, so that the detection of the medium 1 is accurate.

Since the light entering part 11 and the light exiting part 12 of the prism 10 have a cylindrical protrusion shape, the prism 10 can be easily positioned by inserting them into the holes 15 and 16 of the lower conveyance guide 4.

Since the light incident part 11 and the light exit part 12 are located inside the holes 15 and 16, the medium 1 does not come into contact with each other. This does not affect the conveyance state of the medium 1.

Next, a second embodiment according to the present invention will be described.

3 is a perspective view showing the prism case of the second embodiment.

4 is a cross-sectional view showing the prism case of the second embodiment.

The medium detecting device of the second embodiment is provided with the light-shielding cap of the case of the prism in addition to the configuration of the first embodiment.

In FIG. 3, the cap 22 is fitted inside the case 17 in FIG.

The whole cap 22 is formed in the box shape, and the projection part 23a, 23b is formed in both sides.

The protrusions 23a and 23b are inserted into the holes 24a and 24b formed on both sides of the case 17 to fix the cap 22.

Cap 22 is made of resin.

In general, insoluble resins have low light shielding properties, so it is better to mount the prism 10 using the cap 22 formed from such resins in a place not too affected by disturbance light. The rest of the configuration is the same as in the first embodiment.

In the second embodiment configured as described above, by installing the cap 22, the prism 10 is covered with the cap 22 so that dust or the like does not adhere to the prism 10.

It is also strong against secular changes.

As a modification of the second embodiment, the cap may be formed by the light blocking member, and the entire prism 10 may be shaped so as to cover the light incident portion 11 and the light exit portion 12 as well.

In addition, a material having a light shielding property may be used as the material of the cap 22, but in general, a resin having a property of shielding light having a wavelength that can be received may be used.

By using the cap 22 having light shielding properties, it is less likely to be affected by the disturbance light, and the detection operation of the medium is more accurate.

As described in detail above, according to the present invention, by providing a case around the prism, the contamination of the prism can be prevented and the effect of disturbance light is hardly obtained.

1 is a perspective view showing a medium detecting apparatus of a related first embodiment of the present invention.

Fig. 2 is a side sectional view showing the medium detecting device in the first embodiment.

3 is a perspective view showing the prism case of the second embodiment.

4 is a cross-sectional view showing the prism case of the second embodiment.

* Explanation of symbols for main parts of the drawings

1: medium 2: return path

7 light emitting element 8 light receiving element

10: prism 13: first reflecting surface

14: second reflecting surface 22: cap

Claims (5)

A first reflective surface having a light emitting element and a light receiving element on one side of the conveying path for carrying the medium, and reflecting light from the light emitting element on the opposite side of the conveying path; And a peripheral member surrounding the first and second reflecting surfaces of the reflector in a medium detecting apparatus so as to have a reflecting member having a second reflecting surface reflecting toward the light receiving element. The method of claim 1, And the peripheral member is an integral part of the reflector. The method of claim 1, The peripheral member is a medium detection device for blocking the disturbance light. The method according to claim 1 or 2, And a cover member mounted to the peripheral member to cover at least the first and second reflective surfaces of the reflector. The method of claim 4, wherein And the cover member is made of a light blocking material.