JPS6313464A - Light detecting device and light detecting method - Google Patents

Abstract

PURPOSE:To prevent an electric leakage, short-circuit, etc., as well as the influence by a noise by light receiving a light signal turned on and off by an optical switch through an optical fiber to an image sensor as it is. CONSTITUTION:A light source 11 always lights up, and the light from the light source is transmitted through an optical fiber 12. The optical fiber 12 is interrupted at a shielding plate 13, and when the shielding plate 13 is not at the cavity part, the light transmitted through the optical fiber 12 is light-received through the internal part of the optical fiber again from the section of the optical fiber arranged oppositely after the fiber comes out to the cavity part once to the unused bit of an image sensor 14, namely, the light-receiving part at both edge parts usually which is not used for the image reading of a read image 16. For such reason, the light transmitted through the optical fiber 12 is turned on and off in accordance with the opening and closing of the shielding plate 13, this is caught by the image sensor 14, comes to be an electric signal 100 and is outputted to a CUP, etc. Thus, the danger of the electric leakage, electric shorting, etc., can be significantly decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an optical switch device and an optical switch method for an image input device such as a facsimile machine.

(Prior Art) Conventionally, this type of optical switch device uses a photocoupler 3 consisting of a light emitting diode 1 and a phototransistor 2, as shown in Section 3.
configured using In such an optical switch device, the light emitted from the light emitting diode 1 is blocked from entering the phototransistor 2 by using the shielding plate 4.
The on/off operation of the optical switch is input as an electrical signal to the CPUW (not shown) via the boat 5. Here, the above-mentioned optical switch device is used, for example, to detect the opening/closing of a door, detect the cutter position, etc. by operating the shielding plate 4 in conjunction with the opening/closing of the door, the movement of the cutter, etc. However, in such conventional optical switching devices, conductive power lines 6, signal lines 7, etc. are used to supply power to the light emitting diode 1 and take out signals from the phototransistor 2. Must be. For this reason, there is a risk of electrical leakage, short-circuiting, etc., and the disadvantage is that it is particularly easy to pick up noise. Another drawback is that one input port must be prepared for one optical switch.

(Problems to be Solved by the Invention) As mentioned above, since conventional optical switch devices use conductive wire materials, there is a risk of electrical leakage, short circuits, etc., and the drawback is that they are particularly susceptible to picking up noise. There is,
Furthermore, one optical switch requires one input port, making the configuration complicated.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide an optical switch device and an optical switch method that have a simple configuration that is unlikely to cause short circuits and is not easily affected by noise.

``Structure 1 of the Invention (Means for Solving the Problems) The present invention provides an apparatus equipped with an image sensor having unused bits for inputting images, etc., which includes a light source and a light source that electrically transmits the light from the light source. An optical switch device is composed of a fiber, a shielding plate that turns on and off the light transmitted by the optical fiber, and the image sensor that receives the light transmitted by the optical fiber, and the on/off signal from the optical switch is converted into light as it is. A method is adopted in which the information is input to the image sensor.

(Function) In the optical switch device and optical switch method of the present invention,
Since the light on/off signal is transmitted through optical fiber, the amount of conductive wire material can be reduced, eliminating the risk of leakage, short circuits, etc., and eliminating the possibility of picking up electrical noise. Furthermore, since the light on/off signal from the optical fiber is input to the unused bits of the image sensor, the input port that was conventionally required can be omitted and the configuration of the device can be simplified.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
The figure shows an embodiment of the photodetection device of the present invention.

11 is a light source; 12 is an optical fiber that transmits light; 13 is a shielding plate that opens and closes the light transmitted through the optical fiber 12;
4 is an image sensor that inputs an image and converts it into an electrical signal; for example, a COD image sensor is used. 15 is a lens for forming 16 input images on the image sensor 14; 16 is an input image input to the image sensor 14; and 17 is a power source for the light source 11.

Next, the operation of this embodiment will be explained. Usually, the light source 11
is lit all the time, and the light from this light source is connected to optical fiber 1.
2. The optical fiber 12 is interrupted at the shielding plate 13, and the cut ends of the optical fiber 12 are arranged to face each other with a predetermined gap interposed therebetween. The shielding plate 13 is arranged to rotate through the gap. Therefore, when the shielding plate 13 is not present in the gap, the light transmitted through the optical fiber 12 once exits the gap and then enters the optical fiber again from the cut of the optical fiber disposed opposite to it. The signal is then transmitted to the unused bit portion of the image sensor 14. The cut of the optical fiber 12 on the side of the image sensor 14 is arranged opposite to the unused bit part of the image sensor 14, and the light transmitted through the optical fiber 12 is radiated from the cut and sent to the image sensor 14.
The light is received by the unused bits. Therefore, when the shielding plate 13 is rotated to close the gap in the optical fiber 12, no light is transmitted from the shielding plate 13 to the optical fiber on the image sensor 14 side, and no light is received by the image sensor 14. It disappears.

It should be noted that the unused bits of the image sensor 14 refer to light-receiving parts that are normally located at both ends and are not used for reading the image to be read 16. For this reason, the shielding plate 13 is made to rotate in conjunction with the opening/closing operation of the door of the facsimile machine, for example, so that the shielding plate 13 is at position A when the door is open, and when the door is closed. When there is, the shielding plate 13 is B
When the door is opened and closed, the light transmitted through the optical fiber 12 is turned on and off, captured by the image sensor 14, and output as an electrical signal 100 to a CPU (not shown) or the like.

FIG. 2 is a waveform diagram showing an example of the electrical signal 100,
When the image sensor 14 receives light from the optical fiber 12 as shown in FIG. 2(A), a detection signal F based on the received light bit is output, and then an image signal E is output. In addition, an optical fiber 1 is connected to the image sensor 14.
When no light is received from the image sensor 14, only the image signal E is output from the image sensor 14, as shown in FIG. 2(B). Therefore, the CPU (not shown) can know whether the door is open or closed depending on whether the signal F shown in FIG. 2 is present or not.

According to this embodiment, the gap between the optical fiber 12 and the shielding plate 1
The on/off signal of the optical switch consisting of 3 and f's is transmitted to the image sensor 1 as light through a conductive optical fiber 12.
Since the light is incident on the fourth part, the risk of electric leakage, electrical short circuit, etc. can be significantly reduced, and electrical noise will not be picked up, making it possible to prevent malfunctions and the like.

Furthermore, since the on/off signal of the optical switch is received by the unused bit portion of the existing image sensor 14, there is no need to provide an input port exclusively for the optical switch.
The device can be simplified.

Note that the light transmitted through the optical fiber 12 is turned on and off by placing a shielding plate 13 between the light source 11 and the cut end of the optical fiber 12.
You can also do this by doing Y. Furthermore, since there are usually several hundred unused bits at both ends of the image sensor 14, optical signals from at least two systems of optical switches can be detected at both ends of the image sensor 14. .

[Effects of the Invention] As described above, according to the photodetection device and photodetection method of the present invention, the optical signal turned on and off by the optical switch is directly received by the image sensor via the optical fiber, thereby preventing electrical leakage, short circuits, etc. It is possible to make it difficult for this to occur and to be less affected by noise, and furthermore, the configuration of the device can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the photodetection device of the present invention, FIG. 2 is a diagram showing an example of the output signal of the image sensor 14 shown in FIG. 1, and FIG. 3 is a diagram showing an example of the output signal of the image sensor 14 shown in FIG. 1. It is a block diagram showing an example. 11... Light source 12... Optical fiber 1
3...Shielding plate 14...Image sensor agent Patent attorney Nori Chika Kenshu Kanshu Sanno - Figure 1

Claims (1)

[Scope of Claims] 1) A device equipped with an image sensor having an unused light-receiving section, which includes a light source, an optical fiber that transmits light from the light source, and a device that blocks light transmitted by the optical fiber; A photodetection device comprising: a shielding plate that allows light to pass through; and a light receiving section that is not used by the image sensor and receives light transmitted through an optical fiber. 2) A device equipped with an image sensor having an unused light-receiving section, characterized in that a light beam that is blocked and passed by a shielding plate is guided to the unused light-receiving section of the image sensor through an optical fiber. Detection method.