JPH05316433A - Image pickup element - Google Patents

Abstract

PURPOSE:To obtain the miniaturized image pickup element sensing optically an accident such as fire, theft or invasion of a person by containing a circuit component to obtain a video signal corresponding to a video image projected into a CCD into a package. CONSTITUTION:The image pickup element 10 is installed at a location where a monitor object of one wall face close to a ceiling is within its sight in a room being the object of monitor. The element 10 consists of a CCD 12 whose number of picture elements is comparatively less, a package 14 having a window 15 open in a front side of the CCD 12, a frame 11 used to mount the CCD 12 and a lens 13 mounted to a window 15 of the package 14 used to project a beam within the visual field into the CCD 12. Furthermore, a circular thread hole is adopted for the window 15, a screw is formed to an outer circumference of the lens 13 and the focus is easily matched by turning the lens 13 so as to adjust the interval between the CCD 12 and the lens 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup device which optically monitors a space to be monitored and generates a video signal in the space, and particularly detects situations such as fire, theft and intrusion of humans. The present invention relates to a miniaturized image sensor suitable for the purpose.

[0002]

2. Description of the Related Art Conventionally, a dedicated detector has been installed for each object to be detected, such as fire, theft, human invasion and approach. And these fires, theft, human intrusion,
A wide variety of detectors having different operating principles have been developed and used for each detector such as approaching.

As described above, since it was not possible to grasp various situations with one detector, it was necessary to install a detector for each object to be detected.

[0004]

Therefore, the present invention is
This is conceived in order to obtain an output signal that can be used for various purposes and has few false alarms by providing one image sensor with various monitoring functions such as human vision.

[0005]

[Means for Solving the Problems] C having a relatively small number of pixels
The image pickup device is composed of a CD, a package having a window portion opened on the front surface of the CCD, and a lens mounted on the window portion of the package and projecting light rays in the visual field onto the CCD.

[0006]

EXAMPLE As shown in FIG. 2, in a room to be monitored, an image pickup device 10 within the field of view of a monitored object is installed at a portion of one wall near the ceiling.

As shown in the sectional view of FIG. 1, in this image pickup device 10, a small CCD 12 chip having a relatively small number of pixels is mounted on a frame 11, and a window portion 15 is opened in front of this CCD 12. And package with black synthetic resin
Forming 14 A lens 13 for projecting light rays within the field of view onto the CCD 12 is attached to the window portion 15.

If the window 15 is formed in a circular screw hole and a screw is formed on the outer circumference of the lens 13, the lens 13 is rotated to adjust the distance between the CCD 12 and the lens 13 and focus. Can be easily adjusted.

By driving the CCD 12 in the image pickup device 10,
The drive circuit 4 is required to obtain a video signal corresponding to the projected video, and the drive circuit 4 is driven by the clock pulse output from the clock pulse generator 1 to drive the CCD 12. , Generate horizontal and vertical sync signals. The drive circuit 4 and the clock pulse generator 1 are in the same package as the CCD 12.
It may be provided in 14.

Since the image pickup device 10 is mainly used for monitoring, not for generating a high-resolution video signal, the visual field is divided into a plurality of sections, and the brightness information of each section can be obtained. A small CCD 12 having several tens to several hundreds of pixels may be used.

In order to process the video signal output from the CCD 12 of the image pickup device 10, an A / D conversion circuit 2 for converting the output video signal into a digital signal is provided.
The output terminal of the / D conversion circuit 2 is connected to the reference memory 3 and also to one input terminal of the comparison circuit 6. The other input terminal of the comparison circuit 4 is connected to the reference memory 3, and the current video signal output from the A / D conversion circuit 2 and the video signal stored in the reference memory 3 correspond to each pixel. The signals are sequentially compared and the difference between them is output.

In the CPU 7, the output signal of the comparison circuit 6 monitors the data of a specific one pixel, which is not related to the object to be monitored, as the reference of the brightness of the screen. If the difference continues for a certain period of time, it is determined that the brightness in the field of view has changed as a whole, the past video signal stored in the reference memory 3 is erased, and a new image signal is newly added. The current video signal is re-stored, and the re-stored video signal is used as a reference thereafter.

Even if the brightness in the field of view changes as in the case where the illumination is turned on or off, direct AGC control is performed on the CCD 12 itself or the amplifier circuit for amplifying the output thereof. In the output signal of the comparison circuit 6, the CPU 7 operates to monitor the output signal of a specific pixel.
Then, by replacing the data in the reference memory 3, the operation similar to the AGC control can be performed.

In the normal monitoring state, the reference memory 3
The data of each pixel of the reference image is stored in, and the data of each pixel stored in the reference memory 3 and the data of each corresponding pixel of the current video output from the A / D conversion circuit 2 are stored. The comparison circuit 4 sequentially performs comparison, and the difference between the two is output to the CPU 7 via the PIO 5.

As a data processing method for generating an output signal from the output terminal 6 when a change occurs in the video signal, the output of the comparison circuit 6 and the synchronization signal from the drive circuit 4 which determines the coordinates in the screen are used. Various processing methods can be realized by using the CPU 7 to which is input.

(1) When used for the purpose of detecting intrusion or approach of a human, if the output of the comparison circuit 6 is constantly monitored and an output signal is generated when the data of one or more pixels changes. It's good. In this case, for example, if only pixel data of a selected area such as a door or a window required for monitoring is to be monitored, malfunction can be reduced.

(2) When it is used for the purpose of detecting theft, a change occurs in the output of the comparison circuit 6 of the monitored object, for example, the output of the pixel corresponding to the safe or the expensive frame displayed. It is only necessary to generate an output signal when

(3) When used for the purpose of detecting a fire, the upper and lower parts of the screen are monitored separately, and smoke generated in the early part of the fire tends to collect on the ceiling. Pixel data can be used as a smoke detector if it is configured to generate an output signal when the amount of change in pixel data is small, but changes occur in many pixels, but the data in the lower pixel hardly changes. it can.

[0019]

As described above, according to the image pickup device 10 of the present invention, its function can be easily changed by software according to the purpose of use, so that it can be used for various monitoring purposes. The image pickup device 10 as hardware is suitable for mass production and can be manufactured and sold at a low price.

CC used in the image pickup device of the present invention
Since the D12 has a small number of pixels, it can be miniaturized, the resolution of the obtained video signal is poor, and even the facial expression of a human face cannot be grasped. It never happens.

Since the image pickup device of the present invention is extremely small and inexpensive as compared with a normal television camera, it can be widely used in place of the television camera in the field where high resolution image processing is not required. it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an image pickup device of the present invention.

FIG. 2 is a diagram showing an installed state of the image pickup device of the present invention.

FIG. 3 is a block diagram showing an example of a form of use of the image sensor of the present invention.

[Explanation of symbols]

 1 clock pulse generator 2 A / D conversion circuit 3 reference memory 4 drive circuit 5 PIO 6 comparison circuit 7 CPU 8 output terminal 10 image sensor 11 frame 12 CCD 13 lens 14 synthetic resin mold 15 window

[Procedure amendment]

[Submission date] May 6, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

[0005]

And C CD [Means for Solving the Problems], a package having an open window portion on the front surface of the CCD, is mounted to the window portion of the package, formed by a lens for projecting the light beam in the field of view CCD It is an image sensor.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007] mold the image pickup device 10, as shown in the sectional view of FIG. 1, mounted on the frame 11 a small type CCD12 chips, a black synthetic resin by opening the window portion 15 on the front surface of the CCD12 Then, the package 14 is formed. And
A lens 13 for projecting light rays within the field of view onto the CCD 12 is attached to the window portion 15.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The image pickup device 10 may be one that generates a high resolution video signal, but is mainly used for monitoring.
In this case, if it is not necessary to generate a high-resolution video signal , the field of view may be divided into a plurality of sections, and the brightness information of each section may be obtained. It suffices to use a CCD 12 as small as several hundreds.

Claims (2)

[Claims] 1. A CCD having a relatively small number of pixels and the CC
An image pickup device comprising: a package having a window portion opened on the front surface of D; storing the CCD; and a lens mounted on the window portion and projecting a light ray within a visual field onto the CCD. 2. The image pickup device according to claim 1, further comprising means for adjusting a distance between the CCD and the lens.