JP2006100878A - Fitting structure for imaging element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting structure for an imaging element wherein a problem of an inclination of a light receiving face of the imaging element caused by a repulsion force of a dust resistance rubber is solved. <P>SOLUTION: In the fitting structure for the imaging element wherein the dust resistance rubber 13 is clamped between a CCD 12 and a low pass filter 14 and a dust resistance configuration is employed between the light receiving face of the CCD 12 and the low pass filter, the dust resistance rubber 13 comprises a flat surrounding part 13a and a projection 13b formed with an inner hole 13c through which an imaging light passes in a form of down grade from the surrounding part 13a, and the CCD 12 is pressed into contact with the projection 13b of the dust resistance rubber 13 by a pressing force of a plate 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mounting structure for an image sensor provided in a photographing apparatus such as a digital camera, a video camera, and a mobile phone camera.

The digital camera includes an image sensor such as a CCD at the rear part of the lens barrel, and causes subject image light that has passed through the lens to enter the light receiving surface of the image sensor to output an image signal.
That is, the image sensor is housed in a cylindrical holder provided at the rear of the lens barrel.

In many cases, the image sensor is mounted by a unitized mounting structure.
Specifically, this attachment unit attaches the plate to which the image sensor is fixed to the holder-rear surface, and stores and holds the image sensor in a predetermined position in the holder, and also serves as a holder on the light receiving surface side of the image sensor. A low-pass filter is provided therein, and a ring-shaped rubber plate is provided between the image sensor and the low-pass filter.

Since the rubber plate is a dust-proof rubber that prevents dust adhering to the light receiving surface of the image sensor, its peripheral portion is in close contact with the image sensor and the low-pass filter.
That is, the image sensor is urged toward the dust-proof rubber using the elastic force of the plate, and the image sensor is pressed against the dust-proof rubber.

In many cases, the dust-proof rubber is a rectangular ring rubber formed by punching a sheet rubber.
However, some dustproof rubbers have a special configuration, and the dustproof rubber is used to determine the mounting reference position of the image sensor.

  For example, the rectangular dust-proof rubber has a slope formed on two adjacent sides, and a flat portion is provided on the two sides facing the slope.

The dust-proof rubber is incorporated so that the two sides of the flat portion are in contact with the reference protrusion of the holder, and the reference surface of the image sensor is in pressure contact with the two sides of the slope.
For this reason, the image pickup element moves while being moved together by the slope of the dust-proof rubber, and the reference position is positioned.

  In addition, there are various configurations and shapes of the dust-proof rubber, and all of them are configured to be brought into close contact with the image sensor so as to press the image sensor.

Japanese Utility Model Publication No. 2-51469

  As described above, the dust-proof rubber has a dust-proof structure between the image sensor and the low-pass filter. However, in order to press the image sensor with the elastic force of the plate, the dust-proof rubber has a repulsive force. The light receiving surface of the image sensor may be tilted by acting.

  Specifically, since the light receiving surface of the image sensor is tilted from a plane orthogonal to the optical axis of the subject image light (imaging light), one-sided blur occurs and the lens resolving power decreases.

Specifically, because the gap between the image sensor incorporating the dust-proof rubber and the low-pass filter varies due to variations in the package of the image sensor, adhesion lift of the image sensor to the plate, thermal expansion, etc. When the gap is small, the image sensor is pressed against the dust-proof rubber with a strong biasing force.
As a result, the repulsive force of the dust-proof rubber is increased, the plate to which the image sensor is fixed is deformed, and the light receiving surface of the image sensor is tilted.

  In view of the above circumstances, an object of the present invention is to provide an image pickup device mounting structure that solves the inclination of the light receiving surface of the image pickup device caused by the repulsive force of dust-proof rubber.

  In order to achieve the above object, in the present invention, as a first invention, a plate to which an image sensor is fixed is attached to a holder, and a holding means for holding the image sensor at a predetermined position in the holder; In the mounting structure of the imaging element having the optical filter provided in the holder on the light receiving surface side of the element and the dust-proof elastic member provided between the imaging element and the optical filter, the elastic member is A ring-shaped body provided with an inner hole through which imaging light passes, comprising a peripheral portion, and a projecting portion in which the inner hole is formed as a downward gradient from the peripheral portion toward the light receiving surface of the imaging element, An image sensor mounting structure is proposed in which the image sensor is configured to press against the protruding portion of the elastic member.

  According to a second invention, there is proposed an imaging device mounting structure characterized in that, in the mounting structure of the first invention, the protruding portion of the elastic member is formed as a downward slope from a flat plate-shaped peripheral portion.

  According to a third aspect of the present invention, there is proposed an image pickup element mounting structure characterized in that, in the mounting structure of the first aspect of the present invention, the protruding portion of the elastic member is formed so as to be inclined from the peripheral portion.

  According to a fourth aspect of the present invention, in the mounting structure of the first aspect, the elastic member has a flat plate-shaped peripheral portion outer shape that is substantially the same size as the peripheral shape of the optical filter. Propose.

  According to a fifth aspect of the present invention, there is proposed an image pickup device mounting structure characterized in that the optical filter, the elastic member, and the image pickup device have substantially the same outer dimensions in the mounting structure of the first invention.

  As a sixth invention, in the mounting structure of the first invention, the inner diameter of the housing portion of the holder for housing the optical filter, the elastic member, and the imaging element is substantially the same as the outer diameter of the optical filter. An imaging device mounting structure characterized by being formed is proposed.

  As a seventh invention, in the mounting structure of the first invention, the elastic member is provided with a taper at an outer edge of the peripheral portion, and a taper portion in which the taper is formed in the holder. A mounting structure for an image pickup device is proposed in which the elastic member is positioned by being fitted to each other.

As an eighth invention, in the mounting structure of the first invention, the elastic member forms a bulging portion at an outer edge portion of the peripheral portion, and the elastic member is positioned by being biased by the elastic force of the bulging portion. An image pickup device mounting structure characterized by the above structure is proposed.

According to the mounting structures of the first, second, and third inventions, the imaging device is pressed against the protruding portion of the elastic member and receives a weak repulsive force of the protruding portion.
Therefore, the light receiving surface of the image sensor does not tilt due to the repulsive force of the elastic member.

  In addition, if the gap between the image sensor and the optical filter is narrowed due to variations in the image sensor package, adhesion float of the image sensor fixed to the plate, or other thermal expansion, it is given to the image sensor. Due to the urging force, the protruding portion of the elastic member is deformed in a direction that is flush with the planar peripheral portion.

  As a result, since the plate holding the image sensor is not deformed, the light receiving surface of the image sensor does not tilt, and problems such as one-side blur of the subject image do not occur.

  Note that the inner hole of the elastic member has the same or larger size as the effective light receiving surface of the image sensor even when the projecting portion is formed so as to be flush with the planar peripheral portion and the aperture is reduced. To keep.

  Furthermore, since the projecting portion of the elastic member has a downward slope toward the light receiving surface of the image sensor, the image sensor is not vignetted by the projecting portion.

The mounting structure of the fourth invention is advantageous for downsizing the mounting structure because the outer shape of the elastic member is the same as the outer shape of the optical filter.
In addition, even if the projecting portion is deformed, the size of the outer shape of the elastic member does not change, so that a space for releasing the outer peripheral portion of the elastic member is not required.

  Since the mounting structures of the fifth and sixth inventions have the optical filter, the elastic member, and the imaging device having substantially the same outer dimensions, and the inner diameter of the holder accommodating portion is the same as the outer diameter of the optical filter, The mounting structure is not complicated, which is advantageous for downsizing.

According to the attachment structure of the seventh invention, the elastic member is positioned by fitting the taper by incorporating the elastic member.
That is, the center of the inner hole of the elastic member and the center of the light receiving surface of the image sensor can be automatically aligned.

  In the mounting structure of the eighth invention, by incorporating the elastic member into the holder, the elastic member is biased by the bulging portion provided at the outer edge of the peripheral portion, and is automatically incorporated at a predetermined position.

Next, an image pickup device mounting structure provided in a digital camera as a first embodiment of the present invention will be described with reference to the drawings.
In this embodiment, a CCD is used as the image sensor.

FIG. 1 is a sectional view of the mounting structure, and FIG. 2 is an exploded perspective view of the mounting structure.
As shown in these drawings, this mounting structure is a mounting unit in which a CCD 12, a dust-proof rubber 13 as an elastic member, and a low-pass filter (optical filter) 14 are housed in a rectangular tube portion 11a formed in a holder 11. It is configured as.

The rectangular tube portion 11a of the holder 11 is formed to protrude toward the lens side, and the front side (upper side in FIG. 1) is a rectangular hole portion 11b that houses the dust-proof rubber 13 and the low-pass filter 14. The rear side (lower side in FIG. 1) of the hole 11b is a rectangular parallelepiped inner space 11c that houses the CCD.
The inner space 11c has a slightly larger hole diameter than the hole opening 11b.

  In this mounting structure, a low-pass filter 14 is attached to the front end of the rectangular tube portion 11a after the retaining frame 15 is screwed to the holder 11 so that the retaining frame 15 is a rectangular ring. The dust-proof rubber 13 and the CCD 12 are assembled in this order.

That is, after the retaining frame 15 is screwed, the low-pass filter 14 is incorporated into the hole portion 11b, and then the dust-proof rubber 13 is incorporated into the hole portion 11b.
The low-pass filter 14 has a known configuration in the form of a rectangular plate.

The dust-proof rubber 13 is an elastic member of a rectangular ring composed of a flat peripheral portion and a protruding portion.
Details of the dust-proof rubber 13 will be described later.
When the dust-proof rubber 13 is incorporated, positioning is performed so that one corner thereof matches the reference angle of the hole opening portion 11b.

Subsequently, the CCD 12 is incorporated into the inner space 11c.
The CCD 12 is previously adhered and fixed to the surface of the plate 16 with an adhesive, and the plate 16 is screwed to the holder 11 to store the CCD 12 in the inner space 11c.

By assembling the CCD 12 in this manner, the periphery of the light receiving surface of the CCD 12 is brought into pressure contact with the protruding portion of the dust-proof rubber 13.
In other words, a pushing force is applied to the CCD 12 by the elasticity of the plate 16 so that the CCD 12 is pressed against the protruding portion of the dust-proof rubber 13.

  As a result, the protruding portion of the dust-proof rubber 13 is pressed against the periphery of the light receiving surface of the CCD 12 and the peripheral portion of the dust-proof rubber 13 is pressed against the low-pass filter 14, so that the light-receiving surface of the CCD 12 and the low-pass filter 14 are pressed. A dustproof structure is formed between the two.

FIG. 3 is an enlarged cross-sectional view showing the main part of the mounting structure described above, and FIG. 4 is an enlarged perspective view of the dust-proof rubber 13.
As can be seen from these drawings, the dust-proof rubber 13 has a flat peripheral portion 13a, a protruding portion 13b formed by an inclined portion, and an inner hole 13c formed by the protruding portion 13b. .

The protruding portion 13b is an inclined portion having a downward slope toward the CCD 12 at a certain angle (for example, 45 degrees) with respect to the optical axis of the subject image light incident on the CCD 12.
The protruding portion 13b is integrally formed as a downward slope from the inside of the peripheral portion 13a, and has the same thickness as the peripheral portion 13a.

The dust-proof rubber 13 configured in this manner is deformed in a direction (upward in FIG. 3) in which only the protruding portion 13b is flush with the peripheral portion 13a when the CCD 12 is in pressure contact.
And since the protrusion 13b has a weak repulsive force, there is no effect | action which pushes back CCD12.
As a result, the light receiving surface of the CCD 12 does not tilt due to deformation of the plate 16 or the like.

  The mounting structure configured as described above is arranged at the rear part of the photographing lens so that the rectangular tube part 11a of the holder 11 faces the lens side, and subject image light passing through the photographing lens is incident on the CCD 12, and the CCD 12 To output an image signal.

FIG. 5 is a cross-sectional view similar to FIG. 3 showing a modification of the mounting structure described above.
In this embodiment, a flange portion 11d is integrally formed at the tip of the rectangular tube portion 11a instead of the retaining frame 15.

FIG. 6 is a cross-sectional view similar to FIG. 3 showing another modification.
In this embodiment, the outer shapes of the optical filter 14, the dust-proof rubber 13, and the image sensor 12 are approximately the same size, and the inner cylinder is substantially the same as the outer diameter of the optical filter 14 in the rectangular tube portion 11a of the holder 11 that houses them. A portion (housing portion) 11c is formed to simplify and reduce the size of the mounting structure.

FIG. 7 is a cross-sectional view similar to FIG. 3 shown as the second embodiment, and FIG. 8 is a perspective view showing the dust-proof rubber of the second embodiment.
This embodiment is characterized in that a dustproof rubber 17 having a taper 17e formed on the outer periphery is provided, and the rest of the configuration is the same as the mounting structure described above.

As can be seen from FIG. 8, the dust-proof rubber 17 is formed with downwardly inclined tapers 17e on the four sides of the outer periphery.
Reference numeral 17a shown in FIG. 8 is a peripheral portion, 17b is a protruding portion, and 17c is an inner hole, and these have the same configuration as the dust-proof rubber 13 described above.

  Further, a taper part 11e for fitting the dust-proof rubber 17 between the hole part 11b and the inner space part 11c is provided in the rectangular tube part 11a of the holder-11.

In the mounting structure configured as described above, when the dust-proof rubber 17 is incorporated, the taper 17e is fitted into the taper portion 11e of the rectangular tube portion 11a to determine the mounting position.
As a result, the center of the inner hole 17c of the dustproof rubber 17 and the center of the light receiving surface of the CCD 12 can be easily matched.

FIG. 9 is a cross-sectional view similar to FIG. 3 showing the third embodiment, and FIG. 10 is a front view showing the dust-proof rubber of the third embodiment.
This embodiment is characterized in that a bulging portion 18e is provided on two outer peripheral sides of the dust-proof rubber 18, and the other configuration is the same as the mounting structure described above.

As can be seen from FIG. 10, the dust-proof rubber 18 is provided with a bulging portion 18e that is curvedly projected on two adjacent sides.
10, reference numeral 18a is a peripheral portion, 18b is a projecting portion, and 18c is an inner hole, and these have the same configuration as the dust-proof rubber 13 described above.

When the dustproof rubber 18 is incorporated in the hole 11b, the mounting structure configured as described above is biased by the elasticity of the bulging portion 18e as shown in FIG.
As a result, the dust-proof rubber 18 can be automatically incorporated at a predetermined reference position.
11 is a cross-sectional view taken along the line AA in FIG.

Although the preferred embodiments of the present invention have been described above, the protrusions 13b, 17b, and 18b of the dust-proof rubbers 13, 17, and 18 do not necessarily have to be formed as inclined surfaces.
For example, as illustrated in FIG. 12 and FIG. 13, the present invention can be similarly applied to an arcuate concave surface 13e or a convex surface 13f.

  Further, since the dust-proof rubbers 13, 17, and 18 may be elastic members, they may be made of an elastic material such as a synthetic resin material in addition to the rubber material.

  The present invention can be applied to photographing devices such as a digital camera, a video camera, and a mobile phone camera provided with an image sensor.

It is sectional drawing of the attachment structure shown as 1st Embodiment. It is a disassembled perspective view of the said attachment structure. It is sectional drawing which expanded and showed the principal part of the said attachment structure. It is the expansion perspective view which showed the dustproof rubber with which the said attachment structure was equipped. It is sectional drawing similar to FIG. 3 which shows the modification of the said attachment structure. It is sectional drawing similar to FIG. 3 which shows another modification of the said attachment structure. It is sectional drawing similar to FIG. 3 shown as 2nd Embodiment. It is the perspective view which showed the dustproof rubber of 2nd Embodiment. It is sectional drawing similar to FIG. 3 shown as 3rd Embodiment. It is a front view which shows the dustproof rubber of 3rd Embodiment. It is the sectional view on the AA line on FIG. 9 which showed the state which incorporated the dustproof rubber of 3rd Embodiment. It is a partial expanded sectional view of an attachment structure provided with dustproof rubber which has a projection-like part formed with an arcuate concave surface. It is an expanded sectional view similar to FIG. 12 provided with the dustproof rubber | gum which has a protruding part formed of the circular-arc-shaped convex surface.

Explanation of symbols

11 Holder
11a Square tube portion 11b Hole portion 11c Inner space portion 11e Taper portion 12 CCD
13 Dust-proof rubber 13a Peripheral part 13b Protruding part 13c Inner hole 14 Low-pass filter 15 Stop frame 16 Plate 17 Dust-proof rubber 17e Tape
18 Dust-proof rubber 18e Swell

Claims (8)

A plate to which the image sensor is fixed is attached to the holder, the holding means for holding the image sensor at a predetermined position in the holder, the optical filter provided in the holder on the light receiving surface side of the image sensor, In the mounting structure of the image sensor having a dustproof elastic member provided between the image sensor and the optical filter,
The elastic member is a ring-shaped body provided with an inner hole through which imaging light passes, and a projecting portion in which the inner hole is formed as a downward gradient from the peripheral portion toward the light receiving surface of the imaging element. And consist of
A mounting structure for an image sensor, wherein the image sensor is configured to be in pressure contact with the protruding portion of the elastic member. In the mounting structure according to claim 1,
The protruding structure of the elastic member is formed as a descending gradient from a flat peripheral portion. In the mounting structure according to claim 1,
The mounting structure for an image sensor, wherein the protruding portion of the elastic member is formed to be inclined from the peripheral portion. In the mounting structure according to claim 1,
The mounting structure for an image sensor, wherein the elastic member has a peripheral part outer shape substantially the same size as a peripheral outer shape of the optical filter. In the mounting structure according to claim 1,
An image pickup device mounting structure, wherein the optical filter, the elastic member, and the image pickup device have substantially the same outer shape. In the mounting structure according to claim 1,
An image pickup device mounting structure, wherein an inner diameter of a housing portion of the holder for housing the optical filter, the elastic member, and the image sensor is substantially the same as an outer diameter of the optical filter. In the mounting structure according to claim 1,
The elastic member has a configuration in which a taper is provided on the outer edge of the peripheral portion, and this taper is fitted to a taper portion formed in the holder to position the elastic member. A mounting structure of an image sensor as a feature. In the mounting structure according to claim 1,
The mounting structure for an image pickup device, wherein the elastic member is configured to form a bulging portion at an outer edge portion of a peripheral portion, and to position the elastic member by being biased by an elastic force of the bulging portion.

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