JP3002065B2 - Optical low-pass filter holding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a holding structure of an optical low-pass filter used for a movie or an electronic still camera.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional optical low-pass filter holding structure used for a movie or an electronic still camera has a CCD 2 mounted on a CCD plate 1 and a plate-like protection device. The glass 3 is placed on top of the protective glass 3 and an optical low-pass filter (spatial frequency filter, OLP
F) The CCD holder 6 that covers the CCD 2 and the optical low-pass filter 5
Are screwed via screws 7.

The CCD plate 1 is provided with a plurality of through holes (not shown) and is superposed on a substrate (not shown). The lead wires 2a of the CCD 2 penetrate through the through holes from above in FIG. It has become so. Thus, the CCD 2 is mounted on the CCD plate 1 in an integrated state.

In addition, the holding rubber 4 has a flange which is integrally formed on the lower surface of the rectangular cylindrical portion and overlaps with the dust-proof protective glass 3 so as to be smaller than the CCD holder 6. The optical low-pass filter 5 having a variation in dimensions is housed in a tightly fitted state, and has a function of positioning and fixing the optical low-pass filter 5 at a predetermined position.

The optical low-pass filter 5 fixed and positioned is generally made of a quartz plate and has a function of passing only low spatial frequency components.
It is covered with the CCD holder 6 together with D2.

The CCD holder 6 is formed in a substantially pyramid shape having a flat uppermost hole, and screws 7 penetrating through screw holes on both sides are screwed into screw holes on both sides of the CCD plate 1, respectively. Accordingly, the CCD plate 1, the CCD 2, the protective glass 3, the holding rubber 4, and the optical low-pass filter 5 are covered in a stacked state, and the inner peripheral edge of the uppermost portion is engaged with the peripheral edge of the upper surface of the optical low-pass filter 5. Has become. However, the conventional optical low-pass filter holding structure is configured as described above in the assembling process, and then sent to the next process.

However, since the pixel pitch of the CCD is becoming increasingly finer with the recent increase in image quality and miniaturization of the image size, dust and dirt are formed between the protective glass 3 and the optical low-pass filter 5 in the assembly process. (Not shown), a phenomenon occurs that the dust or dust becomes very noticeable.

[0008] Such dust and dirt must be removed without fail. However, in the above-described optical low-pass filter holding structure, if the screw 7 is loosened and the CCD holder 6 is not once removed from the CCD plate 1, the mixed dust and dirt are removed. Dust could not be removed.

[0009]

The conventional structure for holding an optical low-pass filter has the above-described structure.
Unless the CCD holder 6 is once removed from the CCD plate 1 by loosening, the dust or dirt mixed between the protective glass 3 and the optical low-pass filter 5 cannot be removed. Therefore, a removing process is provided separately from the existing process. And the like, and there is a major drawback that the increase in the number of steps cannot be prevented.

The present invention has been made in view of the above, and has as its object to provide an optical low-pass filter holding structure that can prevent an increase in the number of steps with a simple configuration.

[0011]

According to the present invention, in order to achieve the above object, a semiconductor functional device is arranged on a mounting plate, and the semiconductor functional device includes:
Overlay the optical low-pass filter through the protective glass,
A holder that covers the semiconductor functional device and the optical low-pass filter is mounted on the mounting plate, and the optical low-pass filter that is compressed and surrounded by the mounting of the holder to the mounting plate is positioned and fixed inside the holder. An elastic holding member is arranged, and a space is formed in the elastic holding member, which is immersed with the compression to increase the amount of compression of the elastic holding member.

[0012]

According to the present invention having the above structure, the plurality of gaps can be restored to the original state before being immersed, and the elastic holding member restored to the original state can be obtained simply by loosening the screwed fastener of the holder. Since the state of close contact with the optical low-pass filter is released, the optical low-pass filter can be taken out from the hole of the holder without once removing the holder.

However, there is no need to provide a removal step for removing dust and dirt mixed between the protective glass and the optical low-pass filter separately from the existing steps. Dust can be removed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIG. 1. The holding structure of the optical low-pass filter according to the present invention comprises a holding rubber 4A inside a CCD holder 6A screwed to the CCD plate 1. 4A
, A plurality of gaps 8 are formed.

The CCD plate 1 is provided with a plurality of through holes (not shown) and is superposed on a substrate (not shown). The lead wires 2a of the CCD 2 penetrate through the through holes vertically from above in FIG. It has become so.

Thus, the CCD 2 is mounted in a state of being integrated with the CCD plate 1. On the upper surface of the CCD 2, a protective glass 3 for dust protection is placed, and on the upper surface of the plate-like protective glass 3, a holding rubber 4A is placed.

The holding rubber 4A is completely different from the conventional example, and is formed in a substantially frame-like plane slightly larger than the CCD holder 6A, and a step portion 4a for supporting the optical low-pass filter 5 protrudes from the inner peripheral surface thereof. Has been established.

The optical low-pass filter 5 having a variation in size is removably housed therein, and has a function of positioning and fixing the optical low-pass filter 5 at a predetermined position.

As shown in FIG. 1, a plurality of gaps 8 having a substantially oval cross section are formed inside the holding rubber 4A, and the plurality of gaps 8 are formed in the CCD plate 1 of the CCD holder 6A.
On the basis of the screwing, the holding rubber 4A is deformed and squeezed and deforms and protrudes inward, and has a function of easily compressing and deforming the holding rubber 4A and increasing the amount of compression and deformation.

The optical low-pass filter 5 is made of a quartz plate and has a function of passing only a low spatial frequency component, as in the conventional example, and is covered with the CCD 2 and the CCD holder 6A.

The CCD holder 6A differs from the conventional example in that it is formed in a substantially box shape having a flange at the lower part of the peripheral surface, and a hole 6a penetrating through the optical low-pass filter 5 is formed in a flat upper surface. As is apparent from a comparison between FIG. 1 and FIG. 2, it is configured lower than the conventional CCD holder 6.

Then, as the screws 7 passing through the screw holes on both sides of the flange are screwed into the screw holes on both sides of the CCD plate 1, the stacked CCD plates 1 and CC
D2, the protective glass 3, the holding rubber 4A, and the optical low-pass filter 5 are covered.

Therefore, in order to position and fix the optical low-pass filter 5 having variations in dimensions, the holding rubber 4A is required.
The optical low-pass filter 5 is inserted inside the
The CCD holder 6A may be screwed onto the CCD plate 1 so as to cover the CCD holder 6A with screws 7 from above.

Then, as the CCD holder 6A is pressed, the plurality of gaps 8 are deformed and squeezed and deformed and protruded inward, and the holding rubber 4A is significantly compressed and deformed in the center direction, thereby causing the optical low-pass filter 5 to move. The optical low-pass filter 5 is firmly positioned and fixed at a predetermined position.

On the other hand, when removing dust and dirt (not shown) mixed between the protective glass 3 and the optical low-pass filter 5, it is only necessary to loosen the screw 7 of the CCD holder 6A.

Then, the plurality of cavities 8 that have been pressed are restored to the state before the pressing, and the holding rubber 4 that has been significantly compressed is restored.
A is restored to the state before compression, the contact state between the holding rubber 4A restored to the original state and the optical low-pass filter 5 is released, and the optical low-pass filter 5 can be taken out from the hole 6a of the CCD holder 6A. After that, dust and dirt on the protective glass 3 can be removed.

According to the above configuration, the holding rubber 4A and the plurality of gaps 8 are restored to the original state just by loosening the screw 7 of the CCD holder 6A, and the close contact between the holding rubber 4A and the optical low-pass filter 5 is achieved. Since the state is released, CC
The optical low-pass filter 5 can be taken out from the hole 6a of the CCD holder 6A without once removing the D holder 6A.

Therefore, there is no need to provide a removing step for removing dust and dirt mixed between the protective glass 3 and the optical low-pass filter 5 separately from the existing steps. Dust and dirt can be removed.

Further, a part of the optical low-pass filter 5 is exposed from the hole 6a on the upper part of the CCD holder 6A, instead of the structure in which the upper inner peripheral edge of the CCD holder 6A is engaged with the upper peripheral edge of the optical low-pass filter 5. 1 and 2, the CCD holder 6A can be configured to be lower than the conventional CCD holder 6, and compactness can be expected.

In the above embodiment, the substantially frame-shaped holding rubber 4 is used.
Although the case using A is shown, the material and shape are not limited to this, and a holding rubber having a flat pyramid shape with a flat top may be used. Further, the number, shape, and the like of the plurality of voids 8 are not limited to those in the above embodiment.

[0031]

As described above, according to the present invention, only by loosening the screwed fastener of the holder, the plurality of voids are restored to the original state before the immersion, and the elastic holding member, the optical low-pass filter, Is released, so that the optical low-pass filter can be taken out of the holder without once removing the holder.

Accordingly, there is no need to provide a removing step for removing dust and dirt mixed between the protective glass and the optical low-pass filter separately from the existing steps, and the dust on the protective glass has an extremely simple configuration. There is a remarkable effect that dust and dust can be removed.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing one embodiment of a holding structure of an optical low-pass filter according to the present invention.

FIG. 2 is an explanatory sectional view showing a holding structure of a conventional optical low-pass filter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CCD plate (mounting plate), 2 ... CCD (semiconductor function device), 3 ... Protective glass, 4.4A ... Retention rubber (elastic retention member), 5 ... Optical low-pass filter,
6.6A: CCD holder (holder), 8: void.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 4-51154 (JP, U) JP-A 61-156008 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G02B 27/46 G02B 7/00

Claims (1)

(57) [Claims] 1. A semiconductor functional device is arranged on a mounting plate, and an optical low-pass filter is placed on the semiconductor functional device via a protective glass, and the semiconductor functional device and the optical low-pass filter are mounted on the mounting plate. In the holding structure of the optical low-pass filter to which the holder to be attached is attached, inside the holder, an elastic holding member that positions and fixes the optical low-pass filter that is compressed and attached with the attachment of the holder to the mounting plate is arranged, A holding structure for an optical low-pass filter, wherein a gap is formed in the elastic holding member so as to be squeezed with the compression to increase the compression amount of the elastic holding member.