JPS5815372A - Solid-state television camera device - Google Patents

Abstract

PURPOSE:To obtain a solid-state television camera suitable for miniaturization by locating a solid-state image pickup device in slanting to a camera input optical axis. CONSTITUTION:A printed board 2 mounting a CCD3 is located with a slope to an optical axis, other printed boards 4-8 are located with a slope to the optical axis in matching with the location of the board 2, thus the shape of a camera main body is made thin suitable for the use in a narrow and long space. The spacial margin to mount a bias light source 9 is essentially provided, allowing to irradiate a bias light uniformly to the CCD3. Through the location of the CCD with a slope, an image with high resolution can be obtained by using a smaller sized optical system when a CCD with the same number of picture elements, and the number of picture elements of the CCD can be increased with an optical system of the same size, allowing to obtain an image of high resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television camera, and particularly to a solid-state television camera device using a solid-state image sensor.

Solid-state image sensors are smaller and lighter than conventional image pickup tubes, so they are extremely effective in reducing the size and weight of television cameras, and are especially suitable for use in narrow spaces.゛However, in conventional solid-state television cameras, CCD
(Charg@Coupl@d Davlee) A printed board on which a solid-state image sensor and its peripheral circuits are mounted is arranged perpendicular to the camera input optical axis, and the camera input light is directly introduced into the solid-state image sensor. Because
Its external shape is long in the direction perpendicular to the camera input optical axis, so the K is not suitable for use in a narrow, narrow space.

An example of a solid-state television camera device having such a shape is shown in FIG. This diagram shows the upper case of the camera body.
It is a diagram viewed from above.

In the figure, reference number 1 is an imaging lens, 2 is a printed circuit board on which a solid-state image sensor 3 such as a CCD and its peripheral circuits are mounted, 4, 6, . g, 7. II indicates a printed board on which digital circuits, image signal processing circuits, etc. are mounted. C
The printed circuit board 2 on which the CDJ is mounted has many components mounted thereon, such as a COD drive circuit, an input/output circuit, etc., which must be provided very close to the COD due to electrical #1% characteristics. For this reason, the printed circuit board 2 has to be elongated in the direction perpendicular to the optical axis as shown in the figure, and as a result, there is a limit to the miniaturization of the camera body.

Furthermore, the conventional solid-state television camera shown in FIG. 1 has the following problems in addition to its external shape.

In other words, the terminals of printed circuit board 2 must be connected to the terminals of nine printed circuit boards 4 to 8 on which digital circuits, image signal processing circuits, etc. are mounted, but due to the wiring, an appropriate space must be provided between each printed circuit board. must be provided, which increases the proportion of space occupied as a whole, making it difficult to downsize. Furthermore, since there are many printed circuit boards inside the camera body, the number of printed circuit board input/output connectors increases.
This results in a decrease in reliability and an increase in synchronous noise due to the wiring path. Furthermore, rounding KCC6 of solid camera 2 ^ performance improvement
It is well known that there is a technology to irradiate bias light to the camera, but in conventional television cameras as shown in Figure 1, the bias light source is used because the COD is arranged perpendicular to the original axis. installation is difficult. That is, since a space for a bias light source is required between the imaging lens 1 and the CCDJ, the apparatus becomes larger and the mechanism becomes more complicated.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a solid-state television camera device suitable for miniaturization by changing the arrangement method of a printed circuit board on which a COD is mounted.

Another object of the present invention is to provide a solid state television camera device in which a bias light source can be easily installed.

Hereinafter, a solid-state camera device according to the present invention will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of the present invention and is a drawing similar to FIG. 1. In the figure, partial pressures that are the same as in FIG. 1 are given the same reference numbers. As shown in the figure, in the present invention, the printed board 2 on which the CCDJ is mounted is arranged obliquely to the optical axis, and the other printed boards 4 to 8 are also arranged obliquely to the optical axis. The shape of the K-Yoshi camera body has been made thin to create a structure suitable for use in narrow and elongated spaces.

As shown in FIG. 2, the advantage of arranging the COD obliquely to the optical axis has the advantage of making the camera device more compact. - First, in the conventional device, the bias light source was installed in a narrow space between the imaging lens 1 and the printed circuit board 2, so it was difficult to uniformly irradiate the CCD with bias light. However, in the present invention, as shown in FIG. 2, since the printed board 2 is arranged obliquely to the optical axis, there is inevitably a space for installing the bias light source 9, and the lens It becomes a bias light source via a system 10.

Second, it is possible to obtain higher resolution images than conventional devices. Assuming that the COD used in the conventional device has, for example, seven pixels from %A to G in the vertical direction, as shown in Figure 3, if the COD is arranged diagonally, as shown in Figure 3. As shown in Φ), 10 pixels A to J can be provided for the same painting distance. This corresponds to setting 10 pixels to 9 J' in the vertical direction, as shown in FIG. 3(C), and makes it possible to obtain a much higher resolution image. . That is, if the angle between the COD and the optical axis is 45 degrees, the number of pixels will increase six times. In other words, even if the number of pixels is the same, a high-resolution image can be obtained with a smaller optical system if the COD is arranged obliquely to the optical axis.

That is, in the present invention, by arranging the COD diagonally), when using a CCD with the same number of pixels,
High-resolution images can be obtained using a small optical system, while the number of COD pixels can be increased using the same size optical system, making it easier to obtain high-resolution images. Obtainable.

In order to display an image with a large number of pixels and high resolution, the following measures are required.

In other words, if the COD is placed obliquely to the optical axis, the object ab perpendicular to the optical axis will be CCDJ, as shown in Figure 4.
It is extended vertically at the top to look like a'b'. Fourth
There is no change in the length of the subject image in the direction perpendicular to the plane of the drawing.

In order to solve these problems, it is preferable to use the method described below that effectively utilizes the functions of the CC-D.

It is assumed that the COD of FIG. 4 has a horizontal readout register in the direction along a'b' as a secondary element. As shown in FIG. 5, when an object 11 with a cross mark is imaged with C0DI2 arranged diagonally and horizontal readout is performed as usual, a horizontally long cross mark 11 is obtained on C0D11j which is expanded diagonally. It will be done. The actual shape of the cross mark is that of the cross mark 1- on C0D75, which is photographed by the vertically arranged CCDJ:I and shown expanded in the vertical direction. The difference between cross mark 17 and cross mark 14 is C
The former is expanded in the horizontal scanning direction of OD.

The fact that there is no difference in the vertical direction is shown by a circular arc with radius r and 1 drawn around point 0.

Reference numbers 16 and 19 indicate horizontal read registers.

The following procedure can be used to obtain a video signal representing a normal image using a CCD arranged diagonally. In other words, the image captured by the diagonally arranged COD is shown in the horizontal register I of the vertically arranged COD as shown in Figure 6.
When read at the transfer lock frequency of C, a horizontally expanded image appears as shown in FIG. therefore,
As shown in FIG. 6(B), the horizontal readout register 19 (
(Fig. 5), it is possible to read out a larger number of pixels. As a result of rounding, the signal is compressed in time and the normal mis
can be obtained. If the slope of CCDIj in Figure 5 becomes large, the horizontal readout clock frequency may be further increased as shown in Figure IX6 (Q).
The horizontal read clock frequency may be adjusted depending on the degree of slope of D.

COD has horizontal successive registers a/bI in Figure 4.
In some cases, it may be arranged perpendicular to the direction. In this case, as shown in FIG.
The cross mark 2.1 on 28 indicates the CCD 28 arranged vertically.
It extends in the direction perpendicular to the upper cross mark 24. In order to display the cross mark 27 as a normal cross mark 24, the transfer lock frequency of the vertical successive register may be made higher than normal. Reference numbers 26 and 29 are horizontal successive registers.As mentioned above, ccD
tfcFiccDt - Compressing the video signal by arranging the mounted board at an angle to the optical axis and increasing the horizontal or vertical readout transfer lock frequency depending on the degree of inclination. It is possible to configure camera equipment. Note that it is also necessary to change both the horizontal and vertical transfer lock frequencies depending on the direction of inclination of the COD. Note that it is desirable that the optical system be capable of focusing even when the solid-state imaging confectionery is placed diagonally.

In the camera device of the present invention, not only one COD is used as described above, but even more can be obtained by arranging two CCDs 31 and 32 on the base 33 at the same angle of inclination as shown in FIG. Pixelization can be realized. In this case, CCD
By arranging the horizontal successive transfer register 34 in the portion of the CCD 31 where the incident light is blocked by the CCD 32, there is an advantage that a good image without any gaps can be reproduced in the combined video signal. It is also possible to use three or more CODs.

The present invention is an interline transfer CCD and a 7-frame transfer CCD.
CDK can be applied. In the case of frame transfer COD, it is sufficient to adjust the vertical transfer lock pulse in the storage section. The present invention can be applied not only to CODs but also to cameras using MO8 type image sensors, and in this case, the frequency of the vertical or horizontal scanning pulses may be adjusted.

As described above, according to the present invention, since the solid-state imaging probe is arranged at an angle with respect to the camera input optical axis, the solid-state television camera device can be constructed more compactly, and the bias light source can be easily installed. There are benefits to be gained. It is clear that the solid-state television camera device according to the present invention is particularly useful in medical gastrocameras and the like used in elongated and narrow spaces.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional solid-state television camera device.
FIG. 2 is a diagram showing the configuration of a solid-state television camera device according to the present invention, and FIG. 3 illustrates that according to the present invention, high resolution can be achieved by a solid-state image sensor arranged obliquely with respect to the camera input optical axis. Figure 4 is a diagram for explaining the relationship between the subject and the subject image projected onto the solid-state image sensor, and Figure 5 is a diagram for explaining the relationship between the subject and the image of the subject projected onto the solid-state imaging device. A diagram for explaining the relationship with the image captured by the solid-state image sensor, Figure 6 shows a transfer lock pulse used in a solid-state image sensor arranged vertically and a solid-state image sensor arranged diagonally. FIG. 7 is a diagram showing another embodiment of a diagonally arranged solid-state imaging device, and FIG. 8 is a diagram showing an embodiment using two diagonally arranged solid-state imaging devices. DESCRIPTION OF SYMBOLS 1... Imaging lens, 2... Printed board mounting CCD, 3... CCD, 4-8... Printed board for various circuits, 9... Bias light source, 10... Lens. Applicant's representative Patent attorney Takehiko Suzue No. 36!1 (A) CB) No. 4111 (C)

Claims (3)

[Claims] (1) A solid-state television camera device using a solid-state image sensor, characterized in that the solid-state image sensor is arranged at an angle with respect to the camera input optical axis. (2) Claims characterized in that at least one of the horizontal and vertical signal successive frequencies is made bulkier than when the solid-state image sensor is arranged perpendicular to the camera input optical axis. The solid-state television camera device according to item 1. (3) The solid-state television camera device according to claim 1, wherein a plurality of solid-state image sensors are arranged at the same angle of inclination with respect to the camera input optical axis.