JPH0728363B2 - One-dimensional CCD image sensor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a one-dimensional CCD image sensor in which photoelectric conversion elements are linearly arranged, and particularly when a document to be read has various sizes such as a facsimile machine, The present invention relates to a one-dimensional CCD image sensor in which the position of a document can be easily adjusted with a facsimile machine.

[Conventional technology]

Conventionally, the relative position between the optical system including the one-dimensional CCD image sensor and the original is adjusted at the assembly and adjustment stage of a facsimile machine using the one-dimensional CCD image sensor, so the bit mark on the one-dimensional CCD image sensor is adjusted. A small pattern such as a rectangle or triangle
Opposite to the normal use of a facsimile machine, the bit mark is irradiated with light, the reflected light is magnified by a lens to form an image on the document surface, and the positional relationship between the document and the bit mark image is adjusted for alignment. Was going on.

FIG. 7 shows an optical path diagram for explaining the alignment according to the conventional example. One-dimensional CCD image sensor 2 by fluorescent lamp 19
The light reflected by 0 is magnified by the lens 18 and a bit mark image 17 is formed on the first document surface 15 for alignment to form a bit mark image 17 for the first document surface 15. Positioning is performed at the edge of the first document surface 15 using the outer one. When the image 17 of the bit mark is formed on the second document surface 16 which is smaller than the first document surface 15 for alignment, the inside of the bit mark image 17 for the second document surface 16 is used. The alignment is performed at the end of the second document surface 16 by using the above.

[Problems to be solved by the invention]

The above-mentioned conventional one-dimensional CCD image sensor optically enlarges the bit mark approximately 10 times to form an image on the document surface, and therefore the difference in brightness between the bit mark and its outside must be increased. Since the bit mark is created by selectively removing the light-shielding aluminum film of the original CCD image sensor, it has the drawback of causing light leakage output. It is necessary to make the mark small, and even if it is imaged on the original surface at 10 times, it can only be 0.1 mm to 0.2 mm in size, so there is a problem in terms of alignment accuracy and alignment work efficiency. was there.

[Means for solving problems]

The one-dimensional CCD image sensor of the present invention is provided between a photoelectric conversion element array, at least one shift register that receives and transfers charges from the photoelectric conversion element array, and between the photoelectric conversion element array and the shift register. Transfer gate,
An image signal generating circuit including an output circuit for converting the charges transferred by the shift register into a voltage, and another photoelectric conversion element array shielded except for a predetermined element, and from the other photoelectric conversion element array. Another shift register that receives and transfers charge, another transfer gate provided between the other photoelectric conversion element array and the other shift register, and the charge transferred by the other shift register to a voltage. It has an alignment signal generating circuit including another output circuit for conversion.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic plan view of a main part of a sensor chip showing a first embodiment of the present invention. FIG. 2 is a detailed view of part A of FIG.

This embodiment is a 4096-bit one-dimensional line sensor, and includes a photoelectric conversion element array 1 having 4096 light receiving portions 1a, 1b, ....
A shift register 2 for receiving and transferring charges from the photoelectric conversion element array 1, a transfer gate 3 provided between the photoelectric conversion element array 1 and the shift register 2, and a charge transferred by the shift register 2. Output circuit 4 for converting to voltage
And a total of 4096 light-receiving portions 6a shielded by the light-shielding film 12 made of aluminum except the image signal generating circuit including and the second, 376th, 3720th and 4095th light-receiving portions 6b. Other photoelectric conversion element array 6 having ..., Other shift register 7 that receives and transfers electric charge from other photoelectric conversion element array 6, and other photoelectric conversion element array 6 and other shift register 7
It has an alignment signal generating circuit including another transfer gate 8 provided between the two and another output circuit 9 for converting the charge transferred by the other shift register 7 into a voltage.

Next, the operation of this embodiment will be described.

The charges generated by the photoelectric conversion element array 1 arranged in a line are transferred to the shift register 2 at the same time when the transfer gate 3 becomes conductive. Next, the shift register 2 operates to sequentially transfer the charges toward the output circuit 4. The charge transferred to the output circuit 4 is converted into a voltage by the output circuit 4,
The image signal is output from the signal output terminal 5. on the other hand,
Another photoelectric conversion element array 6 for generating an alignment signal, which is arranged in parallel to the photoelectric conversion element array 1 and on the side opposite to the transfer gate 3.
The electric charge generated by is transferred to the other shift register 7 at the same time when the other transfer gate 8 becomes conductive. Next, the other shift register 7 operates to sequentially charge the other output circuit 9
Transfer in the direction of. The charges transferred to the other output circuit 9 are converted into a voltage by the other output circuit 9 and output as a positioning signal from the other signal output terminal 10. The transfer gate 3 and the other transfer gate 8 are connected so that the image output signal and the alignment output signal are synchronized with each other.

Next, document alignment will be described.

FIG. 3 is a plan view of a B4 size document.

Two vertical lines 14a, 14b and 14c, 14d are drawn in pairs on the left and right sides of a B4 size document. Vertical lines 14a, 14b, 14c and 14d
Is divided into 4096 by dividing the paper width (257 mm) of B4 size original into 4096
Assuming a striped area of a book, the first from the left,
It runs in the center of the 3rd, 4094th, and 4096th stripe regions.

FIGS. 4 (a) and 4 (b) are an image signal waveform diagram and an alignment signal waveform diagram at the time of document alignment, respectively.

The maximum size of documents that can be read by the 4096-bit one-dimensional CCD image sensor is B4. Therefore, the striped areas on both the left and right sides of a B4 size document are one of the one-dimensional CCD image sensors.
Since it suffices to correspond to the 4th bit and the 4096th bit, the alignment signal b1 is inserted between the pair of black level data at the left end of the signal output of FIG. The optical system and the position of the original document may be adjusted so that the alignment signal b2 is input therebetween.

Next, using a 4096-bit one-dimensional CCD image sensor,
A case of reading a document of a standard size will be described. The width of a B4 size document is 257 mm, and the width of an A4 size document is 210 mm, so the number of photoelectric conversion elements required is Is. Therefore, bit mark output should be set to the 376th bit and the 3720th bit. That is, FIG. 4 (b)
Since the position alignment signal b3 is at the 376th bit and b4 is at the 3720th bit, the document position is adjusted while observing the output waveform of an A4 size document similar to FIG. 4 (a), and a pair of left black level data and Alignment signal between a pair of right black level data
b3 and b4 should be inserted respectively. However, the paper width of the A4 size manuscript is equally divided into 3347, and the 1st, 3rd, and
Vertical lines are drawn on the 3345th and 3347th stripe regions.

FIG. 5 is a schematic plan view of a main part of a sensor chip showing a second embodiment of the present invention.

In the first embodiment, the present invention is applied to a single channel type one-dimensional CCD image sensor, but in the second embodiment, the present invention is applied to a dual channel type one-dimensional CCD image sensor. It was done. That is, the charges from the photoelectric conversion element array 1 of the image signal generation circuit are alternately arranged bit by bit to the shift register 2 _-1 in which even bits are arranged on the upper side in the drawing and odd bits are arranged on the lower side in the drawing. To the shift register 2 _-2 through the transfer gate 3 and the even and odd bits are separately shifted.
It is transferred to the output side by 2 _-1 , 2 _-2 and gate 2 at the final output stage.
Dual that alternately transfers charges to the output circuit 4 by 0
It is an example when the present invention is applied to a gate type one-dimensional CCD image sensor. In this case, the 1-bit size of the other shift register 7 of the alignment signal generating circuit is 1/2 of the 1-bit size of the shift registers 2 _-1 and 2 _-2 .

FIG. 6 is a schematic plan view of a main part of a sensor chip showing a third embodiment of the present invention.

This embodiment is an image signal from the generation circuit of the photoelectric conversion element array 1 of the even bit shift register 2 _-1 through the output terminal 5 _-1, odd bit shift register _2-2 through the output terminal _5-2
The present invention is applied to a one-dimensional CCD image sensor of each type output from The even bit side in this example, the shift register 2 _-1 of the odd-numbered bit side, Yes respectively to correspondingly aligned signal generating circuit 2 _-2 provided, alignment signal also even bit from the output terminal 10 _-1, The odd bits are output from the output terminal 10 _-2 . The position of the bit mark of the present invention is determined by only one pattern in wafer manufacturing, so that the bit mark position can be easily changed. Also, although the description has been given here for document alignment, when a one-dimensional CCD image sensor is used for measurement, by providing bit marks as many as necessary at necessary locations and outputting alignment signals It has a wide range of applications, including the ability to accurately detect the finished dimensions of products for use.

〔The invention's effect〕

As described above, the present invention provides, on the one-dimensional CCD image sensor, another photoelectric conversion element row for alignment signal generation in parallel with the photoelectric conversion element row arranged in one row or a plurality of rows,
Further provided are another transfer gate and another shift register for transferring the charge from another photoelectric conversion element array to the output side, and another output circuit for converting the charge transferred by the other shift register into a voltage. By using the signal output from the output circuit of the above as an alignment signal, the bit mark is output as an electrical signal without adding any new process to the conventional wafer manufacturing process, and it is arranged in one or more rows. Since it is synchronized with the output of the image signal by the photoelectric conversion element, there is an effect that the position of the document can be aligned accurately and with good workability by a waveform observation device such as an oscilloscope.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a main part of a sensor chip showing a first embodiment of the present invention, FIG. 2 is a detailed view of part A of FIG. 1, FIG. 3 is a plan view of a B4 size original, 4 (a) and 4 (b) are image signal waveform diagrams and alignment signal waveform diagrams, respectively, at the time of document alignment, and FIG. 5 is a schematic plan view of the main part of the sensor chip showing the second embodiment of the present invention. FIG. 6 and FIG. 6 are schematic plan views of a main part of a sensor chip showing a third embodiment of the present invention, and FIG.
The figure is an optical path diagram for explaining the alignment according to the conventional example. 1 ... Photoelectric conversion element array, 1a to 1d ... Photoelectric conversion element array light receiving part, 2,2 _-1 , 2, _-2 ... shift register, 3 ... transfer gate, 4,4 _-1 , 4, _-2 ...... Output circuit, 5,5 _-1 , 5, _-2- …… Output circuit,
6 ... Other photoelectric conversion element array, 6a to 6d ... Light receiving part of other photoelectric conversion element array, 7,7 _-1 , 7, _-2 ... Other shift register, 8,8
_-1 , 8, _-2 ...... Other transfer gates, 9,9 _-1 ,, 9 _-2 ...... Other output circuits, 10,10 _-1 ,, 10 _-2 ...... Other signal output terminals, 11 ...... Clock Input terminal, 12 ... Shading film, 13 ... B4 size document, 14a-14d
…… Vertical line, 15 …… First manuscript surface, 16 …… Second manuscript surface,
17 …… bit mark image, 18 …… lens, 19 …… fluorescent lamp, 20 …… one-dimensional CCD image sensor.

Claims (1)

[Claims] 1. A photoelectric conversion element array, at least one shift register for receiving and transferring charges from the photoelectric conversion element array, a transfer gate provided between the photoelectric conversion element array and the shift register, and An image signal generating circuit including an output circuit for converting the charge transferred by the shift register into a voltage, and another photoelectric conversion element array shielded except for a predetermined element, and a charge from the other photoelectric conversion element array. Shift register for receiving and transferring the signal, another transfer gate provided between the other photoelectric conversion element array and the other shift register, and converting the charge transferred by the other shift register into a voltage A one-dimensional CCD image sensor having an alignment signal generating circuit including another output circuit for performing the above.