JPS6258786A - Solid-state image pickup element - Google Patents

Abstract

PURPOSE:To attain an interlace read without using a excess memory in a frame CCD by connecting the 1st and 2nd horizontal CCDs in parallel to read an odd number field signal and an even number field signal and giving a signal read from the 2nd horizontal CCD to the idle vertical transfer line of a photosensitive section. CONSTITUTION:The horizontal CCDs, 2, 3 are connected in parallel via gate electrodes 11, 12, an odd number field, e.g., is transferred to the horizontal CCD2 and an even number field, e.g., is transferred to the horizontal CCD3 selectively. The electric charge of the odd number field fed to the horizontal CCD2 is fed to a recorder or a display device via a buffer amplifier 4. The electric charge of the even number field fed to the horizontal CCD3 is read and fed to a horizontal CCD7 via buffer amplifiers 5, 6 and also fed to the vertical transfer line after the photosensitive section 1 is read already. Thus, the interlace read is attained by the frame CCD without using an excess memory.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a solid-state image pickup device that is most suitable for electronic still cameras.

(Prior Art) A frame-type CCD has been known as a solid-state imaging device having a photosensitive section and a transfer section. After the charge formed on the photosensitive section corresponding to the subject in the frame type CCD is transferred to the transfer section, reading is performed from this transfer section in accordance with the scanning order.

(Problems to be Solved by the Invention) Although such a frame type CCD has the advantage of being easy to manufacture, it has the disadvantage that it is not possible to selectively read out pixel portions because readout is performed according to the scanning order. have This means that it is not possible to perform field readout in interlaced scanning, which leads to the problem that frame-type CCDs cannot be used in electronic still cameras that require interlaced scanning.

It is also conceivable to temporarily store the readout results in a memory and perform field readout from this memory by interlaced scanning, but this poses the problem of requiring an extra memory.

(Means and effects for solving the problems) The present invention has been made in view of the above points, and an object of the present invention is to enable interlaced reading in a frame type CCD without using extra memory. To achieve this purpose, an 8f!1 horizontal 〇CD and a second horizontal CCD are connected in parallel, and one horizontal 〇CD reads out the odd field signals, the other horizontal CCD reads out the even field signals, and the first and second horizontal 〇CDs are read out. As signals from the photosensitive section are read out to the second horizontal CCD, the signals read from the second horizontal CCD are sequentially sent to vacant vertical transfer lines of the photosensitive section.

(Example〕 Embodiments of the present invention will be described below based on the drawings.

The drawing is a block diagram showing an embodiment of a solid-state image sensor according to the present invention. In the drawing, an image of a subject is formed on a photosensitive section 1, and a charge corresponding to the brightness of the subject is obtained. This charge is transferred to the clock signal φ! through the vertical transfer line inside the photosensitive section 1. ~φ4 and sent to horizontal 0CD2 and 3. Horizontal CCDs 2 and 5 are connected in parallel via gate electrodes, and one field (for example, an odd field) is selected and transferred to the horizontal CCD 2, and the other field (for example, an even field) is selected and transferred to the horizontal CCD 3. be transferred.

The odd field charge sent to the horizontal CCD 2 is
The data is read out and supplied via the buffer amplifier 4 to a recording device and then to a display device (both not shown). Horizontal C0
The charges of the next even field sent to D5 are read out and supplied to the horizontal CCD 7 via buffer amplifiers 5 and 6, and further sent to the vertical transfer line of the photosensitive section 1 from which they have already been read out. During this time, read and send operations are performed by clocks φS and φ6.

The even field charges sent to the photosensitive section 1 are driven by the clocks φl to φ4 and transferred to the water XF-C, OD2, and continue from the odd field charges sent out earlier from the buffer amplifier 4 to the recording device or supplied to the display device.

If noise is mixed into the stain by exposing the photosensitive area 1 between the time when the subject image described above is formed on the photosensitive area 1 and the end of even field reading,
Contamination can be prevented by using the shutter provided on the electronic still camera to keep it dark during this time.

(Effects of the Invention) As explained above, the present invention provides the first horizontal C+CD
and a second horizontal CCD are connected in parallel, one horizontal CCD reads the odd field signal, the other horizontal CCD reads the even field, and as the signal from the photosensitive section is read, the signal read from the second CCD is read out. Since the data are sequentially sent to the vacant vertical transfer lines of the photosensitive area, interlaced readout can be performed with a frame type CCD without using extra memory.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of a solid-state image sensor according to the present invention. 1...Photosensitive section 2.3...Horizontal CCD 4.5.6...Buffer amplifier 7...Horizontal CCD Agent Patent attorney (8107) Kiyotaka Sasaki (and 2 others) Hands F:? llll Authorized October 72, 1985 Commissioner of the Japan Patent Office 7 Ka 3 N 5 [Phase] 6. Number of inventions increased by amendment 20. Page 3, line 1 of the specification, "φ1 to φ4" After “ψ1, ψ2, φ
5I, φ61, φfather, φanti” are added. - On page 3, line 3 of the specification, "gate electrode" is corrected to "gate electrode 11.12". (2) 4HL”b made by 4 Yamahachi lpn h.

Claims (1)

[Claims] 1) In a frame type solid-state imaging device including a first horizontal CCD, a second horizontal CCD is connected in parallel to the first horizontal CCD via a gate electrode, and the second horizontal CCD is connected to the first horizontal CCD in parallel. horizontal CCD
By controlling the gate electrode to selectively transfer only the signal charges of one line of each of the odd and even fields to the second horizontal CCD, which are sequentially transferred to the second horizontal CCD. , one of the two horizontal CCDs outputs only odd field signals, and the other horizontal CCD outputs only even field signals, and the signals read from the second horizontal CCD are output from the first and second horizontal CCDs. The signal for one line is sent to the third horizontal CCD for writing provided on the opposite side of the horizontal CCD and the photosensitive section, and then sent to the vacant vertical transfer line of the photosensitive section, and then sent to the first and second horizontal CCDs. 1. A solid-state image pickup device, wherein the writing is performed sequentially as signals from a photosensitive section are read out. 2) The solid-state imaging device according to claim 1, characterized in that when signals are transferred from the third horizontal CCD to the photosensitive section, the signals are transferred in the order in which the original signals were formed. . 3) The even field signals stored in the photosensitive area after being read from the second horizontal CCD are read out from the first horizontal CCD.
Claim 1 characterized in that it is read from a CD.
The solid-state imaging device described in Section 1. 4) It can be used in an electronic camera system that resets the sensor before opening the shutter, opens and closes the shutter to expose the image sensor, and then reads out an image signal according to the optical signal after closing the shutter. A solid-state image sensor according to claim 1, characterized in that: