JP2601028B2 - Solid color imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a charge coupled device (CCD: Ch).
The present invention relates to a solid-state color imaging device using a solid-state image sensor such as an arge coupled device.

[0002]

2. Description of the Related Art In general, in a solid-state color image pickup device, image pickup light obtained by separating image pickup light into a plurality of color components by a color separation prism and picking up a subject image of each color component by a solid-state image sensor. To form and output a standard color television signal of the NTSC system or the like. Each solid-state image sensor that captures a subject image of each of the above-described color components, via a holder formed of iron or the like,
It was adhered and fixed to each light emitting portion of the color separation prism.

Conventionally, in a solid-state color imaging apparatus using a plurality of solid-state image sensors, it is necessary to superimpose a subject image of each color component picked up by each solid-state image sensor, that is, a state in which a so-called registration adjustment is accurately performed. Need to be maintained. In particular, in a solid-state color image pickup device which achieves high resolution by adopting a so-called space picture element shifting method, it is necessary to secure registration on the order of 1 μm.

[0004]

In general, in a conventional solid-state color image pickup device in which a solid-state image sensor is adhered and fixed to a color separation prism via a holder formed of iron or the like, the thermal expansion coefficient of the holder and the color separation prism is limited. Because of the difference,
If the holder is adhered and fixed to the color separation prism using a hard adhesive, the holder is easily peeled off at a temperature stress of about -20 ° C to 60 ° C, and the holder is separated using an elastic adhesive. If the holder is adhered and fixed, a registration error occurs due to a difference in expansion between the holder and the color separation prism, and it is difficult to secure a desired registration accuracy.

In view of the above-mentioned problems, the present invention prevents the occurrence of a registration error caused by a difference in thermal expansion coefficient between a holder used for mounting a solid-state image sensor and a color separation prism. An object of the present invention is to provide a solid-state color imaging device having a novel configuration capable of performing color imaging with good image quality.

[0006]

In order to solve the above-mentioned problems, a solid-state imaging device according to the present invention is a solid-state imaging device that performs color imaging by a plurality of solid-state image sensors arranged on each light exit surface of a color separation prism. In the color image pickup device, the color separation prism or the solid image sensor is formed of a holding member having a coefficient of thermal expansion near the coefficient of thermal expansion of the package, and is fixed to each light emitting surface of the color separation prism so as to be immovable. And a plurality of first holders each having a plurality of legs, and a holding material having a coefficient of thermal expansion near the coefficient of thermal expansion of the color separation prism or the package of the solid-state image sensor. Are fixed so as not to be movable, and a plurality of legs respectively provided corresponding to the respective legs of the first holding body are provided. A plurality of second holders, and a leg of the first holder fixed to each light exit surface of the color separation prism in a state where registration of the solid-state image sensor is adjusted; The leg of the second holding member fixed to the package of the solid-state image sensor is mechanically joined and fixed with a molten metal.

[0007]

In the solid-state color image pickup device according to the present invention, the image pickup light is separated into a plurality of color components by the color separation prism, and a subject image of each color component is picked up by the solid-state image sensor. The first and second holders disposed between the color separation prism and each solid-state image sensor have a coefficient of thermal expansion near the coefficient of thermal expansion of the package of the color separation prism or the solid-state image sensor. Each solid-state image sensor can be held with extremely high registration accuracy without generating an error.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a solid-state color imaging device according to the present invention will be described below in detail with reference to the drawings.

The embodiment shown in FIGS. 1 and 2 is a three-plate type CC.
The present invention is applied to a D color video camera. The color video camera according to this embodiment converts imaging light incident through an imaging lens (not shown) into three primary colors R, G, and B, that is, red component light R and green component light. A color separation prism 1 for separating the light into light G and blue component light B, and three CCD image sensors 2r, 2g, and 2b for capturing a subject image of each color component separated by the color separation prism 1; NT from each imaging output obtained by the image sensors 2r, 2g, 2b
An SC standard color television signal is formed and output.

In this embodiment, the color separation prism 1 is mounted and fixed to a housing 4 via a prism holder 3, and is not shown mounted on a lens mount 5 provided on the front surface of the housing 4. The imaging light incident through the imaging lens is converted into red component light R, green component light G, and blue component light B.
And is emitted from each emission surface. The respective CCD image sensors 2r, 2
g and 2b are adhered and fixed via holding parts 2r, 2g and 2b, respectively, in a state where registration adjustment is performed accurately.

As shown in an exploded perspective view of the main part of FIG. 2, the holding part 6r has a pair of holder plates 61, 62 having openings 61x, 62x corresponding to the light receiving surface of the CCD image sensor 2r, ie, a first holder plate. And a second holder,
The first holder plate 61 is adhered and fixed to the exit surface of the color separation prism 1 with an elastic adhesive, and the CCD image sensor 2 r is fixed to the second holder plate 62 by mounting screws 65. The CCD image sensor 2r is attached to and fixed to the second holder plate 62, and after performing registration adjustment using a registration adjustment device (not shown),
Each leg 61y, 62 formed at each of the four corners 1 and 62
By mechanically joining the spaces y with, for example, a molten metal such as solder, it is attached and fixed to the emission surface of the color separation prism 1 via the holding component 6r including the holder plates 61 and 62.

In this embodiment, each of the holder plates 61 and 62 constituting the holding component 6r is made of a material having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion ρp (ρp ≒ 7.8 PPM) of the color separation prism 1, for example. Made of permalloy. The thermal expansion coefficient ρc of the package of the CCD image sensor 2r adhered and fixed to the exit surface of the color separation prism 1 via the holding component 6r is about 6.5 ppm. If the expansion coefficient difference between the package of the CCD image sensor 2r and the holding component 6r is about 1.3 PPM, the CCD image sensor adhered and fixed to the exit surface of the color separation prism 1 via the holding component 6r. The registration error in the central portion of 2r is 1 μm or less, and the desired registration accuracy can be obtained.

Here, the other holding parts 6g and 6b, like the holding part 6r, each comprise a pair of holder plates formed of permalloy, that is, a first and a second holding body.

The holding parts 6r, 6g, 6b
Is 1.times. The thermal expansion coefficient of the package of the color separation prism 1 or the CCD image sensors 2r, 2g, 2b.
A desired registration accuracy can be ensured by using a material having a coefficient of thermal expansion within about 5 PPM to about 2 PPM. In addition to the above-mentioned permalloy, a Fe-Ni-Co alloy (Fe: 28Ni: 17Co) is used. : 55) and alumina-based ceramics can be used. When each of the holding parts 6r, 6g, 6b is formed by a pair of holder plates 61, 62 as in this embodiment, the thermal expansion coefficient of the material forming the holder plates 61, 62 is reduced. Even if there is a difference, the displacement due to the difference in the thermal expansion coefficient can be absorbed by the bending of the leg portion 61y of the holder plate 61, and the registration accuracy can be kept extremely high.

[0015]

As described above, in the solid-state imaging device according to the present invention, the solid-state imaging device is mounted on the second holding member independent of the first holding member which is fixed to the light exit surface of the color separation prism so as not to move. Since the solid-state image sensor is fixed so as not to be movable, accurate registration adjustment is performed by the registration adjustment device, and then the legs of the first holding member and the legs of the second holding member are respectively moved. By mechanically bonding and fixing with a molten metal, the solid-state image sensor can be accurately attached to the color separation prism via the first holder and the second holder. Further, since each of the holding members is formed of a holding member having a thermal expansion coefficient close to that of the package of the color separation prism or the solid-state image sensor, these holding members and the package of the color separation prism or the solid-state image sensor are formed. Can be prevented from occurring due to the difference in the coefficient of thermal expansion of the substrate.
Further, the first holding member fixed to the light exit surface of the color separation prism so as not to be movable and the second holder fixed to the package of the solid-state image sensor so as not to be movable.
Of the color separation prism and the first holding member as a unit, and the thermal expansion coefficient of the solid-state image sensor package and the second holding member. The stress caused by the difference in the coefficient of thermal expansion as an integral object can be absorbed by the bending of the leg, and the occurrence of registration errors caused by the difference in the coefficient of thermal expansion can be suppressed.
High registration accuracy can be maintained.
Further, since the first holding member and the second holding member are mechanically joined and fixed at the respective legs by the molten metal, sufficient joint strength can be obtained even if the area to be joined and fixed by the molten metal is small. Therefore, it is possible to suppress the occurrence of a registration error due to the difference between the thermal expansion coefficient of the molten metal and the thermal expansion coefficient of each holding member after the joining and fixing.

Therefore, in the solid-state color image pickup apparatus according to the present invention, each solid-state image sensor can be held with extremely high registration accuracy while suppressing the occurrence of registration errors due to thermal expansion. It can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of a solid-state color imaging device according to the present invention.

FIG. 2 is an exploded perspective view of a main part in which a holding part provided between a CCD image sensor and a color separation prism in the embodiment is exploded.

[Explanation of symbols]

1 ... color separation prism 2r, 2g, 2b ... CCD image sensor 6r, 6g, 6b ... holding parts 61, 62 ... ... holder plate (first and second) Second holder)

Claims (1)

(57) [Claims] 1. A solid-state color imaging device that performs color imaging using a plurality of solid-state image sensors disposed on each light-emitting surface of a color separation prism, wherein the thermal expansion of the package of the color separation prism or the solid-state image sensor is close to the coefficient of thermal expansion. It is formed in the holding member having the rate, unmovable to each light exit surface of the color separation prism
A plurality of first holders, each of which has a plurality of legs, are bonded and fixed as much as possible, and are formed of a holding material having a coefficient of thermal expansion near the coefficient of thermal expansion of the package of the color separation prism or the solid-state image sensor. the package of the solid-state image sensor moves respectively
A plurality of second holders, each of which is immovably fixed and has a plurality of legs provided in correspondence with each of the legs of the first holder, wherein the registration of the solid-state image sensor is performed. Is adjusted, and each light exit surface of the color separation prism is
The fixed leg of the first holder and the solid image;
A solid-state color imaging device in which legs of the second holder fixed to packages of the di-sensor are respectively mechanically joined and fixed with molten metal.