JP2002303773A - Optical device and image pickup device using the same optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device which can prevent an adhesive from flowing to within the effective diameter of an optical element such as an optical lens when the optical element is bonded to a holding part of a housing, etc., and an image pickup device which uses the optical device. SOLUTION: The optical lens 12 has a recessed part 12a, which has a slanting part 12b. The recessed part 12a becomes gradually deeper toward the outer periphery of the optical lens 12 (as shown by an arrow B in the figure) because of the slanting part 12b. The housing 11 is provided with an adhesive coated recessed part 11a. The adhesive coated recessed part 11a is coated with an adhesive 17 and the optical lens 12 is bonded through the adhesive 17. When the optical lens 12 is bonded to the housing 11 through the adhesive 17, part of the adhesive 17 is extruded (as shown by the arrow B in the figure) toward the outer periphery of the optical lens 12 by the slanting part 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical device having an optical element such as an optical lens and an imaging device using the optical device.

[0002]

2. Description of the Related Art Conventionally, as an image pickup device used for a digital camera or the like, an image pickup device as shown in FIG. 9 is known.
The above will be briefly described below with reference to FIGS. 9, an imaging device 9 includes a housing 91, an optical lens 92, a cover 93, an optical filter 94, and an imaging device 9.
5 and an image processing board 96. An optical lens 92, an optical filter 94, and an image processing substrate 96 are adhered to the housing 91. The cover 93 holds the optical lens 92 and is fixed to the housing 91. An image sensor 95 such as a CCD is joined to an image processing substrate 96 including a processing circuit (not shown). Light incident from the outside of the optical lens 92 passes through the optical filter 94 and reaches the image sensor 95, and is processed as data by the image processing board 96.

The housing 91 and the optical lens 92 are often bonded with an adhesive, and the bonding portion has a structure as shown in FIGS. As shown in FIG. 10, an adhesive 97 is applied to a groove 91a for applying an adhesive, and thereafter, as shown in FIG. 11, an optical lens 92 is placed on a housing 91 to perform bonding.

[0004]

However, in recent years,
With the downsizing of an imaging device such as a solid-state imaging device, a holding unit such as an optical element and a housing for holding the optical element is also downsized, and an area for applying an adhesive 97 for bonding the optical lens 92 is also reduced. ing. Therefore, when the conventional bonding method is employed, as shown in FIG. 11, the adhesive 97 is pushed out into the effective diameter of the optical lens 92 by the optical lens 92 and flows into the effective diameter of the optical lens 92. In this case, the light is reflected or blocked by the adhesive 97 flowing into the effective diameter of the optical lens 92, and the light does not reach the image sensor 95 normally, and the image processed by the image processing substrate 96 is processed. There is a problem that data quality is deteriorated.

Therefore, a method of removing the adhesive 97 that has flowed into the effective diameter of the optical lens 92 by a removal operation such as wiping or cleaning can be considered. However, the process becomes complicated, and the optical lens 92 is damaged during the removal operation. This causes a problem of quality deterioration.

In order to prevent the adhesive 97 from being pushed into the effective diameter of the optical lens 92, the adhesive 97 is
It is also conceivable to adjust the amount of the adhesive 97, but as described above, in recent years, the area for applying the adhesive 97 has been reduced. The problem that it is necessary arises.

Therefore, the present invention provides an optical device and an optical device which can prevent an adhesive from flowing into an effective diameter of an optical element when an optical element such as an optical lens is bonded to a holding portion such as a housing. It is an object of the present invention to provide a used imaging device.

[0008]

A first aspect of the present invention includes an optical element and a holding portion to which the optical element is bonded via an adhesive, and a bonding surface of the holding portion to the optical element has An adhesive-coated concave portion to which the adhesive is applied and filled is provided, and a concave portion for receiving the adhesive is provided between the adhesive-applied concave portion and the adhesive surface of the optical element with the holding portion. The optical device is provided with adhesive guiding means for guiding a part of the adhesive toward the outer periphery of the optical element in the recess. For this reason, when the optical element is adhered to the holding portion via the adhesive, if the adhesive is applied excessively, the adhesive guiding means provided on the optical element may cause the adhesive to be applied too much. Since the portion is guided toward the outer circumference of the optical element, it is possible to suppress the adhesive from being pushed into the effective diameter of the optical element, and to prevent the adhesive from flowing into the effective diameter of the optical element. Therefore, it is not necessary to adjust the amount of the adhesive to be applied with high precision.

According to a second aspect of the present invention, the adhesive guiding means is an inclined portion formed on the inner wall of the concave portion so that the depth of the concave portion increases toward the outer periphery of the optical element.

In a third aspect of the present invention, the shallowest portion of the inclined portion coincides with the end of the adhesive-applied concave portion near the optical axis. According to such a configuration, the adhesive can be more reliably guided toward the outer periphery of the optical element, and the adhesive can be prevented from flowing into the effective diameter of the optical element. Further, even when the amount of the adhesive is not so large, since the contact portion is in contact with the adhesive at a portion where the depth of the inclined portion is shallow, even if the amount of the adhesive is slightly different, the bonding is ensured.

According to a fourth aspect of the present invention, the shallowest portion of the inclined portion is shifted closer to the optical axis than the adhesive-coated concave portion. According to such a configuration, the adhesive can be more reliably guided toward the outer periphery of the optical element, and the adhesive can be prevented from flowing into the effective diameter of the optical element. Further, since a gap is formed between the holding portion and the inclined portion, even if the adhesive flows toward the optical axis of the optical element when the optical element is bonded to the holding portion, the adhesive enters the gap. Thus, it is possible to more reliably prevent the adhesive from flowing into the effective diameter of the optical lens.

In a fifth aspect of the present invention, the holding portion is provided with an adhesive guiding groove communicating with the adhesive application concave portion and extending from the adhesive application concave portion toward the outer periphery of the optical element. . With such a configuration, the adhesive can be more reliably guided toward the outer periphery of the optical element, and the adhesive can be prevented from flowing into the effective diameter of the optical element.

A sixth aspect of the present invention includes an optical element and a holding section to which the optical element is bonded via an adhesive, and the adhesive is applied to a surface of the holding section to be bonded to the optical element. An adhesive-coated concave portion to be filled is provided, and the adhesive-coated concave portion is provided on at least one of a bonding surface of the holding portion with the optical element and a bonding surface of the optical element with the holding portion. An optical device which is provided with an adhesive guiding groove which is communicated with and extends from the adhesive application concave portion toward the outer periphery of the optical element. With this, when the optical element is adhered to the holding portion via the adhesive, if the adhesive is applied more, the adhesive guide groove provided in at least one of the holding portion and the optical element is applied more. Since a part of the applied adhesive is guided toward the outer periphery of the optical element, it is suppressed that the adhesive is extruded into the effective diameter of the optical element, and the adhesive flows into the effective diameter of the optical element. Can be prevented.
Therefore, it is not necessary to adjust the amount of the adhesive to be applied with high precision.

According to a seventh aspect of the present invention, a concave portion for receiving the adhesive is provided between the adhesive-applied concave portion and the adhesive surface of the optical element with the holding portion. Adhesive guiding means for guiding a part of the adhesive toward the outer periphery of the optical element is provided. According to such a configuration, the adhesive can be more reliably guided toward the outer periphery of the optical element, and the adhesive can be prevented from flowing into the effective diameter of the optical element.

In an eighth aspect, the adhesive guiding means is an inclined portion formed on the inner wall of the recess so that the depth of the recess increases toward the outer periphery of the optical element.

According to a ninth aspect of the present invention, in the holding section, the optical element is radially positioned by contacting a part of the outer peripheral surface of the optical element, and a gap is provided between the holding section and the outer peripheral surface of the optical element. A plurality of convex portions forming the portion are provided, and the adhesive guiding groove communicates with the gap. According to such a configuration, the adhesive can be more reliably guided toward the outer periphery of the optical element, and the adhesive can be prevented from flowing into the effective diameter of the optical element. Further, the optical element can be more accurately positioned in the radial direction by the convex portion.

In a tenth aspect, the optical element is an optical lens.

In an eleventh aspect, the optical element is an optical filter.

According to a twelfth aspect, there is provided an image pickup apparatus including the above optical device and an image pickup device for receiving light from the optical device. According to such a configuration, it is possible to prevent the adhesive from flowing into the effective diameter of the optical element, and it is possible to prevent the quality of image data from deteriorating.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below based on an embodiment shown in the drawings.

FIG. 1 is a sectional view of the image pickup apparatus according to the first embodiment. FIG. 2 is a plan view of the imaging device shown in FIG. 1 and 2, an imaging device 1 is used for a digital camera or the like, and has a cylindrical housing 11 as a holding portion to which an optical lens 12 is adhered via an adhesive 17 such as an ultraviolet curing resin, and an optical element. An optical lens 12, a cover 13 attached to the housing 11 to sandwich the optical lens 12 between the housing 11 and the optical lens 12, and an optical filter 1 for passing incident light from the optical lens 12 to the image sensor 15.
4, an image sensor 15 and an image processing board 16. Further, a gap 18 is provided between the outer peripheral surface of the optical lens 12 and the inner peripheral surface of the housing 11 as a gap.
A plurality of convex portions 11b that partially contact the outer peripheral surface of the optical lens 12 are provided on the inner peripheral surface of the optical lens 12. The optical lens 12 is positioned in the radial direction by these convex portions 11b.

Note that the imaging device 1 is not limited to use with a digital camera or the like, but can be changed as appropriate. The adhesive 17
Is not limited to an ultraviolet curable resin, and can be changed as appropriate. For example, an organic instant adhesive may be used.

FIG. 3 is an enlarged view of the outer peripheral portion of the optical lens 12 shown in FIG. In the figure, a concave portion 12a is provided in the optical lens 12 over the entire circumference, and the concave portion 12a
Is provided with an inclined portion 12b as an adhesive guiding means over the entire circumference. The depth of the inclined portion 12b gradually increases toward the outer periphery of the optical lens 12 (in the direction of arrow B in the figure). The concave portion 12a and the inclined portion 12b are provided over the entire circumference, but are not limited to the entire circumference, and the optical lens 12
May be partially provided so as to extend in the radial direction. Further, the concave portion 12 a and the inclined portion 12 b may be provided so as to communicate with the gap 18.

FIG. 4 is an enlarged view showing a portion for holding the optical lens 12 of the housing 11 shown in FIG. FIG.
FIG. 4 and 5, the housing 11 is provided with an adhesive application concave portion 11 a on the entire surface of the housing 11 on the bonding surface with the optical lens 12. The adhesive 17 is applied and filled in the adhesive application concave portion 11a.
The optical lens 12 is adhered via. The housing 11 has an adhesive guiding groove 11e which is communicated with the adhesive coating recess 11a and is shallower than the adhesive coating recess 11a. Then, the bonding surface 11c of the housing 11 with the optical lens 12 closer to the outer periphery (closer to the direction of arrow B in the figure) than the adhesive application concave portion 11a in the housing 11 is closer to the optical axis than the adhesive application concave portion 11a. It is lower than the joint surface 11d (close to the direction of arrow C in the figure). Therefore, a gap 19 is formed over the entire circumference between the bonding surface 11c and the bonding surface 12c closer to the outer periphery (closer to the direction of arrow B in the drawing) than the concave portion 12a of the optical lens 12. The adhesive application recess 11a, the adhesive guide groove 11
e and the gap 19 may be provided over the entire circumference, but not limited to the entire circumference, and may be provided partially so as to extend in the radial direction of the optical lens 12. Further, the adhesive application concave portion 11a, the adhesive guiding groove 11e and the gap 19 are
May be provided so as to be communicated with.

Next, the operation of the present embodiment will be described with reference to FIGS.

FIG. 6 shows the housing 11 and the optical lens 1 when the optical lens 12 is bonded to the housing 11 via the adhesive 17.
2 is an enlarged view of a main part of FIG. FIG. 7 is a further enlarged view of the adhesive application concave portions 11a and 12a shown in FIG.
When the optical lens 12 is bonded to the housing 11 via the adhesive 17, the shallowest portion 12 b 1 of the inclined portion 12 b
It coincides with the end of the adhesive application concave portion 11a provided above on the arrow C direction side, that is, the end 11a1 of the optical lens 12 near the optical axis. Therefore, the joining surface 1 of the housing 11
The bonding area between 1d and the bonding surface 12d of the optical lens 12 is large. Therefore, the joining surface 11d and the joining surface 12
The position of the optical lens 12 with respect to the housing 11 that is adjusted by the contact with d improves, and the positional accuracy of the two in the optical axis direction improves.

As shown in FIGS. 6 and 7, when the optical lens 12 is adhered to the housing 11 via the adhesive 17, the adhesive 1
A part of 7 is pushed toward the outer periphery of the optical lens 12 (in the direction of arrow B in the figure) by the inclined portion 12b. Also, the joint surface 11c of the housing 11 and the joint surface 12c of the optical lens 12
The adhesive 17 extruded to the inclined portion 12b flows toward the outer periphery of the optical lens 12 (in the direction of arrow B in the figure) due to the gap 19 between the two. The adhesive 17 flows into a gap 18 between the outer peripheral surface of the optical lens 12 and the inner peripheral surface of the housing 11.

In this manner, the optical lens 12 is
When the adhesive 17 is adhered to the housing 11 through the part, a part of the adhesive 17 (adhesive for a large amount applied) is directed toward the outer periphery of the optical lens 12 by the inclined portion 12b of the concave portion 12a (arrow in the figure). (B direction), the adhesive 17 is suppressed from being pushed into the effective diameter of the optical lens 12, and the adhesive 17 can be prevented from flowing into the effective diameter of the optical lens 12.

The gap 17 between the joint surface 11c of the housing 11 and the joint surface 12c of the optical lens 12 causes the adhesive 17 extruded to the inclined portion 12b to move toward the outer periphery of the optical lens 12 (in the figure). Since it flows (in the direction of arrow B), it is possible to more reliably prevent the adhesive 17 from flowing into the effective diameter of the optical lens 12.

The outer peripheral surface of the optical lens 12 is
The adhesive 17 flows into the gap 18 between the outer peripheral surface of the optical lens 12 and the inner peripheral surface of the housing 11 which is generated by the positioning at b. Can be prevented.

The shallowest part 12b1 of the inclined part 12b is
Since the end portion 11a1 of the optical lens 12 on the inside of the effective diameter of the adhesive application concave portion 11a on the housing 11 coincides with the end portion 11a1, the depth of the inclined portion 12b can be reduced even when the amount of the adhesive 17 applied is not so large. Since the shallow portion is in contact with the adhesive 17, the optical lens 12 and the housing 11 are securely bonded even when the amount of the adhesive 17 applied is slightly different. Also, housing 1
Since the bonding area between the first bonding surface 11d and the bonding surface 12d of the optical lens 12 can be increased, the optical lens 12 can be positioned more accurately in the optical axis direction.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 8 shows an adhesive-coated concave portion 11 a and a concave portion 12.
3A, the shallowest portion 12b1 of the inclined portion 12b is located in the direction indicated by the arrow C in the adhesive application concave portion 11a on the housing 11, that is, the end portion 11a1 of the optical lens 12 near the optical axis. The position is shifted toward the optical axis. Therefore, a gap 110 is formed between the joint surface 11d and the inclined portion 12b.

As shown in FIG. 8, when the optical lens 12 is adhered to the housing 11 via the adhesive 17, a part of the adhesive 17 is directed toward the outer periphery of the optical lens 12 by the inclined portion 12b (see FIG. 8). It is pushed out in the direction of arrow B in the figure. Also, housing 1
Due to the gap 19 between the first bonding surface 11c and the bonding surface 12c of the optical lens 12, the adhesive 17 pushed to the inclined portion 12b flows toward the outer periphery of the optical lens 12 (in the direction of arrow B in the figure). The outer peripheral surface of the optical lens 12 and the housing 11
The adhesive 17 flows into a gap 18 (see FIG. 2) between the inner peripheral surfaces of the adhesive 17.

As described above, the optical lens 12 is connected to the adhesive 17.
When the adhesive 17 is adhered to the housing 11 through the part, a part of the adhesive 17 (adhesive for a large amount applied) is directed toward the outer periphery of the optical lens 12 by the inclined portion 12b of the concave portion 12a (arrow in the figure). (B direction), the adhesive 17 is suppressed from being pushed into the effective diameter of the optical lens 12, and the adhesive 17 can be prevented from flowing into the effective diameter of the optical lens 12.

The gap 17 between the joint surface 11c of the housing 11 and the joint surface 12c of the optical lens 12 causes the adhesive 17 pushed out to the inclined portion 12b to move toward the outer periphery of the optical lens 12 (in the figure). Since it flows (in the direction of arrow B), it is possible to more reliably prevent the adhesive 17 from flowing into the effective diameter of the optical lens 12.

The outer peripheral surface of the optical lens 12 is
The adhesive 17 flows into the gap 18 between the outer peripheral surface of the optical lens 12 and the inner peripheral surface of the housing 11 which is generated by the positioning at b. Can be prevented.

The shallowest part 12b1 of the inclined part 12b is
When the optical lens 12 is bonded to the housing 11 via the adhesive 17, the optical lens 12 is shifted closer to the optical axis than the end 11a1 near the optical axis of the optical lens 12 in the adhesive application concave portion 11a on the housing 11. Position, a gap 110 exists between the joining surface 11d and the inclined portion 12b, and the adhesive 17
When the adhesive flows into the effective diameter from the adhesive application concave portion 11a, the adhesive 17 enters the gap 110 and does not flow further into the effective diameter.
Can be prevented from flowing into the effective diameter of the optical lens 12.

In each of the above examples, the optical lens 12 is used as an optical element. However, the optical element is not limited to this, and can be appropriately changed. For example, an optical filter may be used.

In each of the above examples, the cylindrical housing 11 is used as the holding portion, but the holding portion is not limited to this and can be changed as appropriate.

In each of the above examples, the bonding surface 11c of the housing 11 and the optical lens 1 are formed by providing an adhesive guiding groove 11e shallower than the adhesive coating recess 11a on the housing 11 side.
A gap 19 is formed between the optical lens 12 and the bonding surface 12c.
The gap 19 to be guided toward the outer periphery is not limited to this, and can be appropriately changed. For example, the concave portion 12 is provided on the optical lens 12 side.
a by providing an adhesive guiding groove shallower than a.
A gap may be provided between the first bonding surface 11c and the bonding surface 12c of the optical lens 12.

[0042]

According to the present invention, the adhesive guiding means provided on the optical element, or the holding portion and the optical member, can be provided even when the adhesive is applied to the holding portion via the adhesive, even if the adhesive is applied too much. Since the adhesive guide groove provided on at least one of the elements guides a portion of the over-applied adhesive toward the outer periphery of the optical element, the adhesive is extruded toward the optical axis of the optical element. This prevents the adhesive from flowing into the effective diameter of the optical element. Therefore, it is not necessary to adjust the amount of the adhesive applied with extremely high accuracy, and the bonding workability is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an imaging device illustrating an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1 viewed from the direction of arrow A.

FIG. 3 is an enlarged view of the optical lens shown in FIG.

FIG. 4 is an enlarged view of the housing shown in FIG. 1;

FIG. 5 is an enlarged view of the housing shown in FIG. 4;

FIG. 6 is an enlarged view of a housing and an optical lens shown in FIG. 1;

FIG. 7 is an enlarged view of a bonding portion between the housing and the optical lens shown in FIG. 6;

FIG. 8 is an enlarged view of a bonding portion of a housing and an optical lens in an imaging device according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view of an imaging apparatus showing a conventional example.

FIG. 10 is an enlarged view of the housing shown in FIG. 9;

FIG. 11 is an enlarged view of a housing and an optical lens shown in FIG. 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 imaging device 11 housing (holding portion) 11a adhesive-coated concave portion 11b convex portion 11e adhesive guiding groove 12 optical lens (optical element) 12a concave portion 12b inclined portion (adhesive guiding means) 14 optical filter 15 imaging device 17 adhesive 18 void

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H044 AB02 AB08 2H054 AA01 2H083 AA21

Claims (12)

[Claims] 1. An optical element comprising: an optical element; and a holding portion to which the optical element is bonded via an adhesive, wherein the bonding surface of the holding portion with the optical element is coated with the adhesive. A concave portion for receiving the adhesive is provided between the adhesive coating concave portion and the adhesive surface of the optical element with the holding portion; An optical device, further comprising an adhesive guiding means for guiding a part of the agent toward the outer periphery of the optical element. 2. The adhesive guiding means according to claim 1, wherein the adhesive guiding means is an inclined portion formed on an inner wall of the concave portion so that a depth of the concave portion increases toward an outer periphery of the optical element. Optical device. 3. The optical device according to claim 2, wherein the shallowest portion of the inclined portion coincides with an end of the adhesive application concave portion near the optical axis. 4. The optical device according to claim 2, wherein the shallowest part of the inclined part is shifted closer to the optical axis than the adhesive-coated concave part. 5. The adhesive according to claim 1, wherein the holding portion communicates with the adhesive application concave portion and extends from the adhesive application concave portion toward the outer periphery of the optical element. An optical device comprising a guide groove. 6. An adhesive, comprising: an optical element; and a holding section to which the optical element is bonded via an adhesive, wherein the bonding surface of the holding section to the optical element is coated with the adhesive. An adhesive application concave portion is provided, and at least one of the adhesive surface of the holding portion with the optical element and the adhesive surface of the optical element with the holding portion communicates with the adhesive coating concave portion, and An optical device, comprising: an adhesive guiding groove extending from the adhesive-coated concave portion toward the outer periphery of the optical element. 7. The optical element according to claim 6, wherein a concave portion for receiving the adhesive is provided between the adhesive surface and the holding portion of the optical element.
An optical device, comprising: an adhesive guiding unit that guides a part of the adhesive toward an outer periphery of the optical element. 8. The adhesive guiding means according to claim 7, wherein the adhesive guiding means is an inclined portion formed on an inner wall of the concave portion so that a depth of the concave portion is increased toward an outer periphery of the optical element. Optical device. 9. The optical device according to claim 5, wherein the holding portion abuts a part of an outer peripheral surface of the optical element to position the optical element in a radial direction. An optical device, wherein a plurality of projections forming a gap between the surface and the surface are provided, and the adhesive guiding groove communicates with the gap. 10. The method according to claim 1, wherein
The optical device, wherein the optical element is an optical lens. 11. The method according to claim 1, wherein
The optical device, wherein the optical element is an optical filter. 12. An image pickup apparatus comprising: the optical apparatus according to claim 1; and an image pickup element that receives light from the optical apparatus.