JPH11352311A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device while shielding light from the outside by providing a light shielding plate shielding the light from the outside on a side surface having a specified angle to a bonding surface where a prism and a solid-state image pickup element are bonded. SOLUTION: The light shielding plates 9A and 9B for shielding the light from the outside are provided on a side surface having a specified angle to the bonding surface where the prisms 6A to 6C and the solid-state image pickup elements 7A to 7C are bonded. Namely, the plates 9A and 9B are provided on both side surfaces of a prism block 4 being a direction where the unnecessary light easily enters from the outside because nothing to shield the light exists. In the prism block 4, coating is performed to the 1st to the 3rd prisms 6A to 6C, and the plates 9A and 9B are integrally molded with a pedestal 8 on both side surfaces thereof. By providing the plates 9A and 9B only on both side surfaces where the light from the outside can not be completely shielded by the coating, the entire prism block 4 need not be covered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device, and is suitably applied to, for example, an optical device of a video camera.

[0002]

2. Description of the Related Art Conventionally, in a video camera, an incident image is reflected by three prisms into red, green and blue light.
A so-called 3CCD configuration in which primary colors are separated, and these are taken into corresponding solid-state imaging devices (CCDs: Charge Coupled Devices) to capture an image is widely used as a system capable of obtaining high-quality images.

Incidentally, these three prisms are coated with a black coating called black ink so as to prevent internal light from transmitting to the outside. In addition, this coding also blocks external light, but since the main purpose is to prevent internal light from transmitting to the outside, it is necessary to sufficiently block external light. I can't get it.

However, in a video camera, it is necessary to prevent unnecessary external light from being incident on the prism in order to generate an image with uniform brightness without unevenness. Therefore, in a video camera, an external light is shielded by providing a cover that covers the entire prism block including a prism and a CCD.

[0005]

By the way, in a video camera having such a structure, by providing a cover which covers the entire prism block, light which cannot be shielded by the coating can be shielded, and sufficient coating can be achieved. While it is possible to prevent light from being transmitted into the prism from a portion that has not been subjected to the above, there is a problem that the entire apparatus becomes large.

The present invention has been made in view of the above points, and it is an object of the present invention to propose an optical device that can reduce the size of the entire device while blocking external light.

[0007]

According to the present invention, there is provided an optical apparatus for capturing incident light incident from the outside through a lens into a solid-state imaging device through a prism, wherein the prism and the solid-state imaging device are joined. A light-shielding plate for blocking light from the outside is provided on a side surface having a predetermined angle with respect to the bonding surface.

A light shielding plate for blocking external light is provided on a side surface having a predetermined angle with respect to a bonding surface where the prism and the solid-state image pickup device are bonded, so that the entire optical device can be formed as in the prior art. Since there is no need to provide a light-shielding plate for covering, it is possible to avoid an increase in the size of the entire device.

[0009]

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

In FIG. 1, reference numeral 1 denotes a video camera as a whole, which comprises a main body 2 and a lens section 3.
The lens unit 3 includes a lens 3 </ b> A and a lens barrel 3 </ b> B, and guides incident light L <b> 1 that is incident from the outside to the main unit 2.
The main body 2 is formed by a prism block 4 and a housing 5.

The prism block 4 is provided corresponding to the first, second and third prisms 6A, 6B and 6C and the first, second and third prisms 6A, 6B and 6C. First, second, and third CCDs 7A, 7B, and 7C, pedestal 8 for fixing first, second, and third prisms 6A, 6B, and 6C, and light shielding plate 9A integrally formed with pedestal 8 And 9B. Further, in the prism block 4, a first dichroic film 10 is formed on the boundary surface between the first and second prisms 6A and 6B, and the second and third prisms 6B are formed.
The second dichroic film 11 is formed on the boundary between the first and second dichroic films.

The prism block 4 is designed to make incident light L1 incident from the lens unit 3 incident on the first prism 6A. The first prism 6A uses the first dichroic film 10 to control the green light L of the incident light L1.
1G, the green light L1G is taken into the first CCD 7A, and the remaining blue light L1B and red light L
The light passes through 1R and is output to the second prism 6B.

The second prism 6B reflects the blue light L1B of the blue light L1B and the red light L1R by the second dichroic film 11, and takes the blue light L1B into the second CCD 7B. , And transmits the red light L1R to the third prism 6C. The third prism 6C causes the red light L1R to be captured by the third CCD 7C.

The red light L1R, green light L1G and blue light L1B forming the incident light L1 in this manner are respectively corresponding to the first, second and third CCDs 7A, 7B and 7B.
C is taken in. Therefore, the video camera 1 can reproduce a high-definition image in which the red light L1R, the green light L1G, and the blue light L1B do not interfere with each other.

The first, second and third prisms 6A, 6B and 6C are provided with a black coating (light shielding film). This coating prevents internal light from transmitting to the outside, and does not sufficiently shield external light. Therefore, the prism block 4 must be provided with a light shielding plate around the prism block to block external light.

In this case, the first, second and third prisms 6A, 6B and 6C and the first, second and third CCDs 7
The first, second, and third CCDs 7A, 7B, and 7C that block most of unnecessary light are provided on the bonding surface with A, 7B, and 7C. Third prisms 6A, 6B and 6C and first, second and third CCDs
On the side surface in the direction perpendicular to the bonding surface with 7A, 7B, and 7C, there is no light blocking member.

Accordingly, the video camera 1 shown in FIG.
As shown in FIG. 2 which is a cross-sectional view in the direction A, the light shielding plates 9A and 9B are integrally formed on the pedestal 8 so as to face each other, and the first, second and third prisms 6A, 6B and 6C, and The first, second, and third CCDs 7A, 7B, and 7C cover side surfaces of the shield glass from both sides. As described above, the prism block 4 is provided with the light shielding plates 9A and 9 on both side surfaces of the prism block 4, in which no light is blocked and unnecessary light is likely to enter from the outside. Specifically, as shown in FIG. 3, the light shielding plates 9A and 9B are integrally formed on the pedestal 8 so as to cover both side surfaces of the prism block 4 in a U-shaped cross section.

In the above configuration, the prism block 4
Now, the first, second and third prisms 6A, 6B and 6
C is coated, and light shielding plates 9A and 9B are integrally formed on the base 8 on both side surfaces thereof.
As described above, the prism block 4 has nothing to block external light, and the light shielding plates 9A and 9B are provided only on both side surfaces which cannot sufficiently block external light by coating.
Need only be provided, it is not necessary to cover the entire prism block 4 as in the related art, so that the entire apparatus can be downsized.

According to the above configuration, the first, second, and third
The prisms 6A, 6B and 6C are coated with a light shielding plate 9A on both side surfaces of the prism block 4.
And 9B, the light shielding plates 9A and 9B need only be provided on both side surfaces of the prism block 4 which cannot sufficiently block the external light depending on the coating, and thus the external light can be provided. The device can be further miniaturized as compared with the related art while shielding light.

In the above-described embodiment, the light shielding plates 9A and 9B are provided so as to cover both side surfaces of the prism block 4.
However, the present invention is not limited to this, and the first, second and third prisms 6A, 6B and 6C
Even if a light-shielding plate having a size corresponding to the light-shielding by the coating applied to the above is provided, the same effect as in the above case can be obtained.

For example, as shown in FIG. 4 in which the same reference numerals are given to the corresponding parts in FIG. 1, the prism block 22 includes a first prism 6A, a second prism 6B, and a second CCD 7B. Light-shielding plates 24A and 24B are integrally formed on the pedestal 23 so as to cover only the enclosed portion where there is a possibility that the coating is not sufficiently applied.

When the light shielding plates 9A and 9B (FIG. 1) are provided so as to cover both side surfaces of the prism block 4, the user can use the first, second and third prisms 6A and 6A.
A coating is applied before fixing 6B and 6C to the pedestal 8, or a gap that allows coating after fixing the first, second and third prisms 6A, 6B and 6C to the pedestal 8, It is necessary to form it between the first, second and third prisms 6A, 6B and 6C and the light shielding plates 9A and 9B.

On the other hand, the light shielding plates 24A and 24B which cover only a part of both side surfaces of the prism block 22 are provided.
Is provided, the user fixes the first, second, and third prisms 6A, 6B, and 6C to the base 23,
Coating can be easily applied.

In the above embodiment, the case where the first, second, and third CCDs 7A, 7B, and 7C are applied as the solid-state imaging device has been described. However, the present invention is not limited to this. Other various solid-state imaging devices such as a bucket brigade device) may be applied.

Further, in the above-described embodiment, the case where the present invention is applied to the prim block 4 of the video camera 1 has been described. However, the present invention is not limited to this, and the point is that the incident light is incident from outside through a lens. The present invention can be widely applied to an optical device that captures light into a solid-state imaging device through a prism.

[0026]

As described above, according to the present invention, a light-shielding plate for blocking external light is provided on a side surface having a predetermined angle with respect to a joint surface where a prism and a solid-state image sensor are joined. This makes it possible to further reduce the size of the device as compared with the related art while blocking external light.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a video camera according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a video camera.

FIG. 3 is a schematic diagram illustrating a configuration of a light shielding plate.

FIG. 4 is a schematic diagram illustrating a configuration of a video camera according to another embodiment.

[Explanation of symbols]

1 ... video camera, 2 ... body part, 3 ... lens part,
4 ... Prism block, 5 ... Housing, 6 ... Prism, 7 ... CCD, 8 ... Pedestal, 9 ... Light shielding plate.

Claims (2)

[Claims] 1. An optical device for taking incident light incident from outside through a lens into a solid-state imaging device through a prism, wherein a side surface having a predetermined angle with respect to a joining surface where the prism and the solid-state imaging device are joined. An optical device, further comprising a light-shielding plate for shielding external light. 2. An optical device comprising: a light-shielding film coated on a surface of the prism; and a size and a position corresponding to an area of a large amount of transmitted light among light transmitted through the light-shielding film into the prism. The optical device according to claim 1, further comprising the light shielding plate provided.