JP3200983B2 - CCD sealed container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CCD hermetic container for hermetically storing a CCD.

[0002]

2. Description of the Related Art Conventionally, a CCD (Charge Coupled Device) has been used.
It is known that dark current flows in ice) in proportion to the ambient temperature. When the CCD is used as an image sensor of an image scanner or the like, the dynamic range is narrowed because the dark current becomes noise. Therefore, the dark current is reduced by cooling the CCD,
The dynamic range is being widened.

In order to cool the CCD, it is necessary to take measures against dew condensation. Therefore, it is necessary to store the CCD in a sealed container, enclose a gas such as dry nitrogen in the container, or evacuate the container. Has been done.

[0004] The operation of sealing a gas such as dry nitrogen in a conventional CCD sealed container is performed as shown in FIG.

[0005] In FIG. 4, a CCD 101 is soldered to a rigid substrate 102 and fixed to a CCD sealed container 103 by screws. A glass plate 104 is attached to the upper portion of the CCD sealed container 103, thereby keeping the atmosphere in the CCD sealed container 103.

[0006] Outside the CCD sealed container 103, there is a CCD.
A container 105 is provided so as to wrap the entire closed container 103. Through-hole 105a provided in the lower part of container 105
And 105b are connected to the valve 106a or the valve 106
b, they are connected to a vacuum pump 107 and a gas cylinder 108, respectively.

[0007] The operation of filling gas into the CCD sealed container is as follows.
The process is started with the glass plate 104 opened. Valve 1
06a is opened and the air in the CCD sealed container 103 is sucked into the vacuum pump 107. When a certain degree of vacuum is reached, the valve 1
06a is closed. Open the valve 106b and open the gas cylinder 1
From 08, gas is sealed in the container 105.

When gas is sealed in the container 105, CC
The inside of the D sealed container 103 is also filled with gas. In this state, the glass plate 104 is attached to the CCD sealed container 103, and the operation of filling gas into the CCD sealed container is completed. Then, after closing the valve 106b, the CCD 106
The sealed container 103 is taken out of the container 105 and used by being attached to an image scanner or the like.

[0009]

The conventional CCD described above.
When gas is sealed in a sealed container, it is necessary to replace the entire atmosphere in a relatively large-capacity container surrounding the CCD sealed container, and a means for assembling the CCD sealed container while maintaining the gas atmosphere in the container is required. is there. Therefore, a relatively large facility is required for the vacuum pump, the gas cylinder and the container surrounding the CCD sealed container, and there is a problem that the cost is increased.

When performing maintenance on the CCD, it is necessary to temporarily remove the CCD sealed container from the image scanner or the like, perform maintenance on the CCD, and then reattach the CCD sealed container to the image scanner or the like. There is a problem that maintenance work such as redoing the position adjustment becomes very complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in view of the fact that by replacing a small volume atmosphere in a CCD sealed container, it is possible to perform a gas filling operation with a relatively small facility. Aim. Another object of the present invention is to make it possible to re-enclose gas while the CCD sealed container is attached to an image scanner or the like, so that maintenance work of the CCD can be easily performed.

[0012]

In order to achieve this object, a CCD sealed container according to the present invention comprises a sealed container for accommodating a CCD, a valve provided at an end of the sealed container, and an end of the sealed container. And a sealing plug for sealing the opening.

Preferably, the valve provided at the end of the closed vessel is a valve that opens when a pipe is connected and closes when the pipe is disconnected.

Further, preferably, the distance between the valve provided at the end of the closed container and the opening provided at the end of the closed container is increased.

[0015]

In the CCD sealed container having the above structure, a valve, an opening and a sealing plug are provided, and only a small volume atmosphere in the CCD sealed container is exchanged by operating the valve and the sealing plug. The gas can be sealed in the facility.

Also, a CCD provided with a valve and a sealing plug
Since the sealed container is attached to an image scanner or the like, and the valve and the sealing plug can be operated and the gas can be refilled with the sealed container attached to the image scanner or the like, maintenance work of the CCD can be easily performed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of a CCD sealed container according to the present invention.

In FIG. 1, a CCD 1 is an FPC (Flexibl
e Print Circuit) placed on the substrate 2 and housed in the front cover 5 and the rear cover 6. The FPC board 2 has a CCD 1
And power supply to the Peltier element 3 described later, and C
Used to output an image signal obtained by CD1. The front cover 5 and the rear cover 6 are fixed with screws while sandwiching the FPC board 2 from above and below. The appearance at this time is as shown in a perspective view in FIG.

An O-ring 7a is provided at the lower end of the front cover 5 so as to make one turn around the lower side. Also, an O-ring 7b is provided at the upper end of the rear cover 6 so as to make one round around the lower side. This O-ring 7a is F
By contacting the upper surface of the PC board 2 and the O-ring 7b contacting the lower surface of the FPC board 2, airtightness in the front cover 5 and the rear cover 6 is ensured. O-rings 7a and 7
Since b is only used as a seal member, it can be used in combination with a rubber plate or the like. Further, an adhesive or the like can be used instead.

At the center of the upper portion of the front cover 5, a glass plate 8 is fixed to the front cover 5 with screws by a fixing plate (not shown). An O-ring 9a is arranged between the glass plate 8 and the front cover 5 to maintain airtightness between the two. At the lower center of the rear cover 6, a radiator 10 is fixed to the rear cover 6 by pressing screws (not shown). An O-ring 11a is arranged between the radiator 10 and the rear cover 6 to maintain airtightness between the two.

The upper center of the radiator 10 is in contact with the lower surface of the Peltier element 3, and the upper part of the Peltier element 3 is in contact with the lower surface of the CCD 1. The lead wires of the cuboid Peltier element 3 are wired to the FPC board 2. By arranging the Peltier element 3 so as to be sandwiched between the CCD 1 and the radiator 10, the Peltier element 3 has the largest contact area,
Contact with D1 and radiator 10. This allows
The thermal conductivity between the Peltier element 3 and the CCD 1 and the radiator 10 is improved. That is,
The springs 4a and 4b press the CCD 1 from above so that the Peltier element 3 is pressed against the CCD 1 and the radiator 10. The upper and lower surfaces of the Peltier element 3 are coated with a high thermal conductive silicon resin or the like for the purpose of improving thermal conductivity.

At the upper left end of the front cover 5, a coupling 12 is provided. In this coupling 12,
As shown in FIG.
Is connected. A discharge opening 5a is formed at the upper right end of the front cover 5. These couplings 12
The operation of injecting a gas such as dry nitrogen into the CCD sealed container using the discharge opening 5a is performed as follows.

First, the valve 25 is opened and the gas cylinder 24 is opened.
, A gas such as dry nitrogen is injected into the CCD sealed container for a predetermined time. At this time, the air in the CCD sealed container is sent out of the container through the discharge opening 5a by the injected gas. When air is sent out of the container, air may remain at the corners of the CCD sealed container. Therefore, each corner of the front cover 5 and the rear cover 6 is provided with a sufficient radius to minimize the residual amount. I try to avoid it. Also, CC
D In order to facilitate the diffusion of air into the closed container, the positions of the coupling 12 and the discharge opening 5a are set such that the distance between the coupling 12 and the discharge opening 5a increases.

Furthermore, when a gas having a specific gravity lower than that of air such as dry nitrogen is filled in the CCD sealed container, the dry nitrogen simply moves from the upper left to the upper right in the container.
It may not diffuse into a closed CD container. In order to avoid such a state, a discharge opening 5a may be provided at the lower right end of the rear cover 6.

When the inside of the CCD sealed container is filled with gas, the discharge opening 5a is sealed by screwing the plug 13 into the discharge opening 5a. Thereafter, the valve 25 is closed, and when the pipe from the valve 25 is disconnected at the coupling 12, the gas cylinder 24 is separated from the CCD sealed container. Note that the coupling 12 has a function as a valve that opens when the pipe from the valve 25 is connected and closes when the pipe is disconnected.

The CCD sealed container thus filled with a gas such as dry nitrogen is used by being attached to an image scanner or the like. As described above, the Peltier element 3 is C
When power is supplied to the Peltier element 3 via the FPC board 2 in a state where the Peltier element 3 is pressed against the CD 1 and the radiator 10, the Peltier element 3 cools the CCD 1 by the Peltier effect,
The radiator 10 will be heated. By cooling the CCD 1 in this manner, the dark current can be reduced and the dynamic range can be expanded.

The present invention has been described with reference to the embodiments.
According to the technical idea of the present invention, various modifications are possible. For example, in the above-described embodiment, the coupling 12 is assumed to have a function as a valve that opens when the pipe from the valve 25 is connected and closes when the pipe is disconnected. When a coupling having no valve function is used as the coupling 12, the gas cylinder 24 and the CCD sealed container are separated between the valve 25 and the gas cylinder 24.

[0029]

As described above, according to the CCD sealed container of the present invention, a valve, an opening and a sealing plug are provided, and only a small volume atmosphere in the CCD sealed container is replaced by operating the valve and the sealing plug. As a result, gas can be sealed with relatively small equipment.

Also, a CCD provided with a valve and a sealing plug
Since the sealed container is attached to an image scanner or the like, and the valve and the sealing plug can be operated to re-enclose the gas while being attached to the image scanner or the like, the maintenance work of the CCD can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a CCD sealed container according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a CCD sealed container according to the present invention.

FIG. 3 is a schematic front view showing an embodiment of a CCD sealed container according to the present invention.

FIG. 4 is a front view showing an example of a conventional CCD sealed container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CCD 2 FPC board 3 Peltier element 4a Spring 4b Spring 5 Front cover 5a Discharge opening 6 Rear cover 7a O-ring 7b O-ring 8 Glass plate 9a O-ring 10 Radiator 11a O-ring 12 Coupling 13 Plug

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-57-124456 (JP, A) JP-A-61-8957 (JP, A) JP-A-61-59756 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01L 27/14 H01L 27/148 H01L 23/02 H01L 23/20

Claims (3)

(57) [Claims] 1. A closed container for accommodating a CCD, a valve provided at an end of the closed container, an opening provided at an end of the closed container, and a sealing plug for sealing the opening. A CCD sealed container characterized by the above-mentioned. 2. A valve provided at an end of the closed container,
2. The CCD according to claim 1, wherein the valve is a valve that opens when a pipe is connected and closes when the pipe is disconnected.
Closed container. 3. The CCD sealed container according to claim 1, wherein the distance between the valve provided at the end of the closed container and the opening provided at the end of the closed container is increased.