JPH05284510A - Color separation prism device - Google Patents

Abstract

(57) [Summary] [Objective] In a color separation prism device used in a three-plate video camera or the like, it is possible to easily form an organic film for preventing blue wraparound flare and ghost due to reflection outside the effective image pickup area of the solid-state image pickup device. The purpose is to improve the yield and stabilize the quality. [Structure] An organic film 3a, between the prism blocks 1a, 1b and 1c and the solid-state imaging devices 2a, 2b and 2c,
Ghost flare is prevented by the configuration in which the thin glass plates 5a, 5b and 5c on which 3b, 4 and 3c are formed are arranged. The glass plate on which a plurality of organic films are formed is cut to form a predetermined thin glass plate, and the thin glass plate is aligned with the solid-state imaging device, so that the quality is stable, the manufacturing yield is good, and mass production is easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color separation prism device used in a three-plate video camera or the like.

[0002]

2. Description of the Related Art Conventionally, a trimming film for a prism is provided on the exit surface of the prism, and a ghost prevention mask for the solid-state image sensor is provided on the solid-state image sensor side.

A conventional color separation prism device will be described below. In FIG. 2, 11a is a prism block for green, 11b is a prism block for blue, and 1b is a prism block for blue.
Reference numeral 1c is a prism block for red, and a prism for color separation is formed by these three prism blocks.
12a, 12b and 12c are prism blocks 11
solid-state image sensor for a, 11b and 11c, 13a, 1
Reference numerals 3b and 13c denote black frame-shaped organic films formed on the surfaces of the solid-state imaging devices 12a, 12b and 12c, and 14
Is a blue organic film formed on the emission surface of the blue prism block 11b.

With respect to the color separation prism device including the above-mentioned constituent elements, the relationship and operation of each constituent element will be described.

White light that has entered the prism is separated into three colors by a green prism block 11a, a blue prism block 11b, and a red prism block 11c. The reflected light is the solid-state image sensor 1 for blue.
Since it goes around to 2b, it causes a ghost flare, and as a countermeasure against it, a blue organic film 14 is formed on the emission surface of the prism block 11b for blue. Further, as a countermeasure against ghost flare generated by light reflected outside the effective image pickup areas of the solid-state image pickup devices 12a, 12b, and 12c, the solid-state image pickup devices 12a, 12b, and 12 are used.
A black frame-shaped organic film 13 as a light-shielding mask on the surface of c
a, 13b and 13c are formed. Therefore, it is possible to prevent the light from sneaking into the prism block 11b for blue, and the solid-state imaging devices 12a, 12 for each color.
It is possible to prevent ghost flare that is caused by reflection outside the effective imaging areas of b and 12c.

[0006]

However, in the above-mentioned conventional structure, the blue organic film 14 is formed on the prism block 11b.
The technique for forming a solid state image pickup device 12a, 12b and 12c, and the technique for forming the black organic films 13a, 13b and 13c on the solid state image pickup device 12a, 12b and 12c are limited to printing on a solid body and are difficult to automate. However, there is a problem that the quality is not stable and the cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a color separation prism device which is stable in quality, has a good manufacturing yield, and is highly workable.

[0008]

In order to achieve this object, the color separation prism device of the present invention comprises a blue organic film on the incident surface side between the prism block and the solid-state image pickup device, and a facing emission surface side. It has a structure in which a thin glass plate on which a black organic film is formed is disposed.

[0009]

With this structure, the blue and black organic films can be easily and accurately printed in the state of a single thin glass plate, and the black organic film can be easily aligned in advance with the effective image pickup area of the solid-state image pickup device and easily joined. It will be possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

A feature of the present invention is that thin glass plates 5a, 5b and 5c are provided between the prism blocks 1a, 1b and 1c and the solid-state image pickup devices 2a, 2b and 2c in the above-mentioned conventional structure. There is something I did. That is, the blue organic film 4 is entirely formed on the incident surface side of the blue thin glass plate 5b, and the black frame-shaped organic film 3b is printed on the facing emission surface side. On the thin glass plates 5a and 5c for green and red, black frame-shaped organic films 3a and 3c are printed only on the emission surface side. In this embodiment, the blue organic film 4 is not printed on the green and red thin glass plates 5a and 5c, but there is no problem even if it is printed. The black frame-shaped organic films 3a, 3b and 3c printed on the respective thin glass plates 5a, 5b and 5c are aligned with the effective image pickup areas of the solid-state image pickup devices 2a, 2b and 2c and bonded in pairs. The prism blocks 1a, 1b and 1c are adhered after the solid-state imaging device units 6a, 6b and 6c are formed.

The operation of the color separation prism device configured as described above will be described below. The white light incident on the prism is separated into three lights for green, blue and red.
Part of the light reflected by the blue prism block 1b
However, since the blue organic film 4 is provided on the entire surface of the thin glass plate 5b, light other than blue does not pass and reflected light is prevented. In addition, each solid-state imaging device 2a, 2b and 2
Although ghost flare occurs even with light reflected outside the effective image pickup area of c, reflection is prevented by the black organic films 3a, 3b and 3c.

As described above, according to this embodiment, the blue organic film 4 is formed on the incident surface side, the thin glass plate 5b on which the black organic film 3b is printed on the emission surface side, and the black organic film 3a is formed on the emission surface side. 3c
The thin glass plates 5a and 5c with the printed
By adhering the respective solid-state image pickup device units 6b and 6a and 6c formed by bonding to 5a and 5c to the prism blocks 1b and 1a and 1c, ghost flare can be appropriately prevented, and a plurality of glass plates can be formed. After forming the organic film, the glass plate can be cut to form a predetermined thin glass plate, so the quality is stable and mass production is easy, and furthermore, the thin glass plate is aligned and bonded to the solid-state image sensor. The work is easy, the production yield is improved, and the quality is stable.

[0015]

As is apparent from the above description of the embodiments, according to the present invention, a blue organic film is provided on the incident surface side and a black organic film is provided on the opposite exit surface side between the prism block and the solid-state image sensor. Due to the configuration in which the thin glass sheet having the organic film formed thereon is disposed, it is possible to realize an excellent color separation prism device with stable quality, good production yield, and high workability.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the concept of essential parts of a color separation prism device according to an embodiment of the present invention.

FIG. 2 is a schematic front view showing the concept of a main part of a conventional color separation prism device.

[Explanation of symbols]

1a, 1b, 1c Prism block 6a, 6c Solid-state image sensor unit (solid-state image sensor / black organic film / thin plate glass) 6b Solid-state image sensor unit (solid-state image sensor / black organic film / thin plate glass / blue organic film)

Claims (1)

[Claims] 1. A plurality of prism blocks for color separation,
A thin plate glass disposed on each emission surface of the prism block, and a color separation prism device including a solid-state imaging device disposed on each emission surface of the thin glass, at least one or more of the thin glass plate, Arranged on the joint surface of the solid-state image sensor and the organic film of a predetermined color adhered to the entire surface of the prism block, so as to be outside the effective image pickup area of the solid-state image sensor. The other thin glass plate has a black frame-shaped organic film, and the other thin glass plate has a black frame-shaped organic film disposed so as to be outside the effective image pickup area of the solid-state image sensor. A color separation prism device having an organic film.