JP2005274895A - Lens unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely prevent a liquid adhesive from flowing to a lens part or the like in a lens unit constituted by sticking an optical lens to a lens holding member. <P>SOLUTION: In the lens unit constituted by sticking the optical lens to the lens holding member with the liquid adhesive, a recessed part in which the mount part of the optical lens is housed is formed on the lens holding member, and also the mount part of the optical lens is formed to be fit in the recessed part. Then, a groove-like adhesive inflow part in which the adhesive easily flows is formed on the surface of the mount part abutting on the wall surface of the recessed part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens unit formed by bonding an optical lens to a lens holding member.

Conventionally, as a focus detection device disposed in a camera or the like, for example, a device disclosed in Japanese Patent Application Laid-Open No. 7-49227 is known.
In the focus detection device disclosed in this publication, the engaging portion of the optical lens is bonded to the engaging portion of the lens holding member with an adhesive.
A liquid reservoir is formed in the engaging portion of the lens holding member, and the adhesive is stored in the liquid reservoir by injecting the adhesive from a defective portion formed in the engaging portion of the optical lens.

Then, the adhesive accumulated in the liquid reservoir is sucked into the contact surface between the engaging portion of the optical lens and the engaging portion of the lens holding member by capillary action, and the engaging portion of the optical lens and the lens holding member are engaged. The contact surface with the part is adhered.
JP 7-49227 A

However, in the conventional focus detection device, when a thermosetting adhesive is used as the adhesive when the instantaneous adhesive or solvent cannot be used due to the material of the optical lens, whitening, etc., the main agent (separate) separated from the adhesive Has a problem in that it adheres to the lens portion and the like, thereby deteriorating the optical performance.
That is, in general, a thermosetting adhesive is configured by mixing a main agent and a curing agent, and the main agent is reduced in viscosity during curing, easily causes capillary action, and is separated from the curing agent. And the isolate | separated main ingredient flows in and adheres to a lens part etc., and reduces optical performance.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a lens unit that can easily and surely prevent a liquid adhesive from flowing into a lens portion or the like.

  The lens unit according to claim 1 is a lens unit formed by adhering an optical lens to a lens holding member with a liquid adhesive, and the lens holding member has a concave portion in which a mounting portion of the optical lens is accommodated. The mounting portion of the optical lens is formed so as to fit into the recess, and a groove-like adhesive inflow portion into which the adhesive can easily flow is formed on a surface of the mounting portion that contacts the wall surface of the recess. It is formed.

The lens unit according to claim 2 is the lens unit according to claim 1, wherein the adhesive is made of a one-component thermosetting adhesive, and a gap dimension between the abutting surface and the wall surface is set to the thermosetting. The size is such that the separation liquid of the adhesive adhesive does not flow.
The lens unit according to claim 3 is the lens unit according to claim 1, wherein the adhesive is made of a one-component thermosetting adhesive, and contacts the corner of the mounting portion from the adhesive inflow portion. A second adhesive inflow portion is formed through the surface.

The lens unit according to claim 4 is the lens unit according to any one of claims 1 to 3, wherein the abutting surface is in a plane perpendicular to an optical axis direction of the optical lens. It is a positioning reference surface for the lens holding member.
(Function)
In the lens unit of the first aspect, the mounting portion of the optical lens is fitted into the recess formed in the lens holding member. When a liquid adhesive is dropped in the vicinity of the adhesive inflow portion of the attachment portion, the liquid adhesive flows into the adhesive inflow portion, and the attachment portion is bonded to the wall surface of the recess by the adhesive.

In addition, since the adhesive inflow portion is formed on the surface of the mounting portion that contacts the wall surface of the recess, the liquid adhesive that has flowed into the adhesive inflow portion is prevented from flowing out from both sides of the adhesive inflow portion. The
In the lens unit according to claim 2, the gap between the wall surface of the mounting portion that contacts the wall surface of the concave portion and the wall surface is set such that the separation liquid of the thermosetting adhesive does not flow, thereby flowing into the adhesive inflow portion. The separated liquid separated from the thermosetting adhesive is prevented from flowing out from both sides of the adhesive inflow portion.

In the lens unit of the third aspect, since the second adhesive inflow portion is formed at the corner of the attachment portion, when a one-component thermosetting adhesive is dropped in the vicinity of the adhesive inflow portion of the attachment portion, At the same time as the adhesive flows into the agent inflow portion, the adhesive flows into the second adhesive inflow portion, and an adhesive flow in the direction of the adhesive inflow portion and the second adhesive inflow portion is formed.
Accordingly, the flow of the adhesive in the direction not to the adhesive inflow portion and the second adhesive inflow portion is remarkably reduced, and the adhesive exists in a state of being confined on the corner side of the attachment portion, and the thermosetting Sometimes the separation liquid from the one-component thermosetting adhesive is also confined to the corner side.

  In the lens unit according to the fourth aspect, the position of the optical lens with respect to the lens holding member in the plane perpendicular to the optical axis direction of the optical lens is determined by the positioning reference surface that is in contact with the wall surface of the concave portion of the mounting portion.

In the lens unit according to the first aspect, since the adhesive inflow portion is formed on the surface of the mounting portion that contacts the wall surface of the concave portion, it is possible to prevent the liquid adhesive from flowing into the lens portion or the like.
In the lens unit according to claim 2, since the gap between the surface of the mounting portion that comes into contact with the wall surface of the concave portion and the wall surface is such that the separation liquid of the thermosetting adhesive does not flow, Can be prevented.

In the lens unit according to the third aspect, since the second adhesive inflow portion is formed at the corner of the attachment portion, it is possible to reduce the separation liquid from flowing into the lens portion or the like.
In the lens unit according to claim 4, the position of the optical lens relative to the lens holding member in the plane perpendicular to the optical axis direction of the optical lens can be easily and reliably determined by the positioning reference surface that contacts the wall surface of the concave portion of the mounting portion. it can.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
1 to 3 show a first embodiment of the lens unit of the present invention.
In this embodiment, an optical lens 1 made of a convex lens is held by a lens holding member 3.

The optical lens 1 is made of resin, glass, or the like, and attachment portions 1b are integrally formed at three locations on the outer periphery of the lens portion 1a.
The attachment portion 1b has a rectangular parallelepiped shape, and is formed so as to protrude from the outer periphery of the lens portion 1a at an angle of 120 degrees.
As shown in FIG. 2, the upper surface of the mounting portion 1b is an adhesive application surface 1c, and the lower surface is an optical lens side reference surface 1d.

The lens holding member 3 is made of resin or metal and is formed in a cylindrical shape.
A concave portion (notch portion) 3 a is formed on the lens holding member 3 at an angle of 120 degrees.
The recess 3a has a rectangular parallelepiped shape, and is opened from the upper surface 3b of the lens holding member 3 to the inner peripheral surface 3c.

And the attachment part 1b of the optical lens 1 is fitted by this recessed part 3a.
As shown in FIG. 3, a holding member side reference surface 3 d is formed on the bottom surface of the recess 3 a so that the optical lens side reference surface 1 d of the mounting portion 1 b of the optical lens 1 contacts.
The optical lens side reference surface 1d and the holding member side reference surface 3d are used as reference surfaces for positioning the optical lens 1 in the optical axis direction.

In this embodiment, as shown in FIG. 1, the surfaces on both sides of the mounting portion 1b of the optical lens 1 fitted in the recess 3a of the lens holding member 3 are contact surfaces 1e that substantially contact the wall surface of the recess 3a. Has been. One contact surface 1e is formed with a groove-like adhesive inflow portion 1f into which the one-component thermosetting adhesive 5 can easily flow.
The contact surface 1e and the wall surface on which the adhesive inflow portion 1f is formed are built-in contact surfaces that require highly accurate positioning dimensions, and the gap size is a one-component heat as described later. The dimensions are such that the separation liquid of the curable adhesive 5 does not flow.

In this embodiment, the mounting portion 1b of the optical lens 1 is bonded to the wall surface of the recess 3a by the adhesive inflow portion 1f and the one-component thermosetting adhesive 5 existing in the vicinity thereof.
The lens unit described above is manufactured as described below.
First, the mounting portion 1b of the optical lens 1 is accommodated and fitted in the recess 3a formed in the lens holding member 3, and the holding member side reference surface 3d formed on the bottom surface of the recess 3a of the lens holding member 3 is optically connected. An optical lens side reference surface 1d formed on the mounting portion 1b of the lens 1 is brought into contact.

In this state, the one-component thermosetting adhesive 5 is dropped into the vicinity of the adhesive inflow portion 1f of the attachment portion 1b, so that the one-component thermosetting adhesive 5 becomes the adhesive inflow portion. 1f, and the mounting portion 1b of the optical lens 1 is bonded to the wall surface of the recess 3a by the adhesive inflow portion 1f and the one-component thermosetting adhesive 5 in the vicinity thereof.
In the lens unit described above, since the adhesive inflow portion 1f is formed on the contact surface 1e that contacts the wall surface of the recess 3a of the mounting portion 1b, the one-component thermosetting adhesive 5 that has flowed into the adhesive inflow portion 1f. However, it can be prevented that the liquid flows out from both sides of the adhesive inflow portion 1f and flows into the lens portion 1a or the holding member side reference surface 3d.

  In this embodiment, the gap between the wall surface of the mounting portion 1b that is in contact with the wall surface of the recess 3a and the wall surface are dimensioned so that the separated liquid of the one-component thermosetting adhesive 5 does not flow. The separation liquid separated from the one-component thermosetting adhesive 5 flowing into the inflow portion 1f is prevented from flowing out from both sides of the adhesive inflow portion 1f and into the lens portion 1a or the holding member side reference surface 3d. can do.

That is, the one-component thermosetting adhesive 5 is formed by mixing, for example, a main agent made of a thermosetting epoxy resin and a fine capsule-like curing agent that is destroyed by heat.
In such a one-component thermosetting adhesive 5, the main agent having a high viscosity at room temperature is reduced in viscosity due to an increase in temperature due to heating for curing and becomes liquid.
On the other hand, in the case of a fine capsule-like curing agent, for example, the capsule is broken at a temperature of 50 ° C. to 60 ° C., and the hardening agent and the main agent come into contact with each other by breaking the capsule, whereby the adhesive 5 is cured.

And, as shown in FIG. 4, when the gap dimension W1 between the wall surface 3e of the recess 3a and the contact surface 1e of the mounting portion 1b is relatively large, when the one-component thermosetting adhesive 5 is heated, Before the hardener capsule breaks down, the viscosity of the main agent decreases, and as shown by arrows in FIG. 4, only the main agent becomes a gap between the wall surface 3e of the recess 3a and the contact surface 1e of the mounting portion 1b due to capillary action. Flow into.
When the main agent thus separated from the curing agent adheres to the holding member side reference surface 3d or the lens portion 1a via the lens holding member 3, the optical performance of the lens unit is significantly deteriorated.

Therefore, in this embodiment, the separation liquid W of the one-part thermosetting adhesive 5 does not flow due to the capillary phenomenon in the gap dimension W1 between the wall surface 3e of the recess 3a and the contact surface 1e of the attachment part 1b. By making the dimensions 30 to 80 μm, the separation liquid is prevented from flowing out from both sides of the adhesive inflow portion 1f and flowing into the lens portion 1a or the holding member side reference surface 3d.
In the lens unit described above, the optical lens side reference surface 1d formed on the mounting portion 1b of the optical lens 1 is brought into contact with the holding member side reference surface 3d formed on the bottom surface of the concave portion 3a of the lens holding member 3, Since the mounting portion 1b is bonded to the wall surface 3e of the recess 3a without bonding this surface, the state of the reference surfaces 1d and 3d is not changed by the one-component thermosetting adhesive 5, and the reference The optical lens 1 can be bonded to the lens holding member 3 with high accuracy because there is no layer of the one-component thermosetting adhesive 5 between the surfaces 1d and 3d.
(Second Embodiment)
FIG. 5 shows a second embodiment of the lens unit of the present invention. In this embodiment, the present invention is applied to a camera focus detection apparatus.

In this embodiment, a separator lens 11 constituting an optical system of a phase difference detection type focus detection apparatus is held by a lens holding member 15 made of resin via a diaphragm mask 13.
A sensor holding member 19 is supported on the lens holding member 15 via an inclination adjusting member 17 made of resin.

The sensor holding member 19 is disposed so as to cover the upper surface of the rectangular sensor package 21.
At both ends of the sensor holding member 19, a projecting portion 19a having an L-shaped cross section is formed, and the projecting portion 19a is fitted to the sensor package 21 and adhered by an adhesive.
In the sensor package 21, for example, a rectangular sensor 23 made of a CCD is disposed.

FIG. 6 shows a state before the separator lens 11 is assembled to the lens holding member 15.
As shown in FIG. 6, the lens holding member 15 has a rectangular parallelepiped shape, and a rectangular opening 15a for introducing light from the subject that has passed through the condenser lens is formed in the center on the back side. .

Further, the lens holding member 15 is formed with a rectangular recess 15b into which the separator lens 11 is fitted.
At the corner of the bottom surface 15c of the recess 15b, a rectangular protrusion 15d that protrudes toward the separator lens 11 is formed.
A holding member side reference surface 15e is formed at the upper end of the protruding portion 15d.

Boss portions 15f and 15h are formed in the vicinity of the opening 15a of the bottom surface 15c of the recess 15b.
A concave arcuate surface 15j is formed outside the concave portion 15b of the lens holding member 15 via a partition wall 15i.
As shown in FIG. 5, a convex arc surface 17a of the inclination adjusting member 17 is fitted to the arc surface 15j.

In the vicinity of the concave arcuate surface 15j of the lens holding member 15, a triangular pyramid-shaped adhesive injection port 15k is formed.
The separator lens 11 is made of resin, glass or the like, and the outer shape around the lens is formed in a substantially rectangular parallelepiped shape.
Attachment portions 11e are formed at the four corners of the separator lens 11, and an optical lens side reference surface 11d is formed on the bottom surface of the attachment portion 11e.

The optical lens side reference surface 11d is in contact with a holding member side reference surface 15e formed in the concave portion 15b of the lens holding member 15.
7 and 8 show a state in which the separator lens 11 is assembled to the lens holding member 15.
In this embodiment, the attachment portion 11e of the separator lens 11 fitted in the recess 15b of the lens holding member 15 is formed with a contact surface 11h that substantially contacts the wall surface of the recess 15b.

The contact surface 11h is formed with a groove-like adhesive inflow portion 11f through which the one-component thermosetting adhesive 5 can easily flow.
In addition, a second adhesive inflow portion 11j is formed at a corner of the attachment portion 11e from the adhesive inflow portion 11f via a contact surface 11h (separated).
The gap dimension between the contact surface 11h where the adhesive inflow portion 11f is formed and the wall surface is very small so that the separated liquid of the one-component thermosetting adhesive 5 does not flow, as in the first embodiment. It is said that.

Further, the contact surface 11 h that contacts the wall surface of the recess 15 b of the attachment portion 11 e is a positioning reference surface for the lens holding member 15 of the separator lens 11 in a plane perpendicular to the optical axis direction of the separator lens 11.
The lens unit described above is manufactured as described below.
First, the separator lens 11 is received and fitted in the concave portion 15b formed in the lens holding member 15, and the separator lens 11 is attached to the holding member side reference surface 15e formed on the bottom surface of the concave portion 15b of the lens holding member 15. The optical lens side reference surface 11d formed on the portion 11e is brought into contact.

  In this state, the one-component thermosetting adhesive 5 is dropped in the vicinity of the adhesive inflow portion 11f and the second adhesive inflow portion 11j of the attachment portion 11e, thereby making the one-component thermosetting. The adhesive 5 flows into the adhesive inflow portion 11f and the second adhesive inflow portion 11j, and the attachment portion 11e of the separator lens 11 is connected to the adhesive inflow portion 11f, the second adhesive inflow portion 11j, and the vicinity thereof. The one-component thermosetting adhesive 5 is bonded to the wall surface of the recess 15b.

In the lens unit of this embodiment, the same effect as that of the first embodiment can be obtained.
In this embodiment, since the second adhesive inflow portion 11j is formed at the corner of the attachment portion 11e at a distance from the adhesive inflow portion 11f, the one-component thermosetting adhesive 5 is attached to the attachment portion. 11e exists in a state of being confined on the corner side, and since the separation liquid from the one-component thermosetting adhesive 5 is also confined to the corner side at the time of thermosetting, the separation liquid is in a lens portion or the like. Can be reduced.

  That is, since the second adhesive inflow portion 11j is formed at the corner of the attachment portion 11e at a distance from the adhesive inflow portion 11f, for example, as shown in FIG. 9, the adhesive inflow portion 11f of the attachment portion 11e. When the one-component thermosetting adhesive 5 is dropped onto the point A in the vicinity of the second adhesive inflow portion 11j, as shown by the arrow, the one-component thermosetting property is applied to the adhesive inflow portion 11f. At the same time as the adhesive 5 flows, the one-component thermosetting adhesive 5 flows into the second adhesive inflow portion 11j, and one liquid in the direction of the adhesive inflow portion 11f and the second adhesive inflow portion 11j. A flow of the curable thermosetting adhesive 5 is formed.

Accordingly, the flow of the one-component thermosetting adhesive 5 in the direction other than the adhesive inflow portion 11f and the second adhesive inflow portion 11j is remarkably reduced, and as shown by a two-dot chain line in FIG. Thermosetting adhesive 5 is present in a state of being confined in the corner portion of the mounting portion 11e, and the separation liquid from the one-component thermosetting adhesive 5 is also on the corner side during thermosetting. It becomes in a confined state.
Further, in the lens unit described above, the contact reference surface 11h that contacts the wall surface of the concave portion 15b of the attachment portion 11e is a reference surface for positioning the separator lens 11 with respect to the lens holding member 15 in a plane perpendicular to the optical axis direction of the separator lens 11. As a result, the position of the separator lens 11 relative to the lens holding member 15 in the plane perpendicular to the optical axis direction of the separator lens 11 can be determined easily and reliably.

  In the lens unit described above, the optical lens side reference surface 11d formed on the attachment portion 11e of the separator lens 11 is brought into contact with the holding member side reference surface 15e formed on the bottom surface of the concave portion 15b of the lens holding member 15, Since the mounting portion 11e is bonded to the wall surface of the recess 15b without bonding this surface, the state of the reference surfaces 11d and 15e is not changed by the one-component thermosetting adhesive 5, and the reference surface The separator lens 11 can be adhered to the lens holding member 15 with high accuracy because there is no intervening five layers of one-component thermosetting adhesive between 11d and 15e.

In the above-described embodiment, the example in which the one-component thermosetting adhesive 5 is used as the adhesive has been described. However, the present invention is not limited to such an embodiment. The present invention can also be applied when using an agent or the like.
In the above-described embodiments, the flow path is provided on the lens side, but may be provided on the lens barrel or the holder side.

It is a top view which shows 1st Embodiment of the lens unit of this invention. It is a disassembled perspective view which shows the lens unit of FIG. It is sectional drawing which shows the lens unit of FIG. It is explanatory drawing which shows the detail of the principal part of FIG. It is sectional drawing which shows the focus detection apparatus with which 2nd Embodiment of the lens unit of this invention is applied. It is a disassembled perspective view which shows the lens holding member and separator lens of FIG. FIG. 7 is a top view showing a state where a separator lens is incorporated in the lens holding member of FIG. It is sectional drawing of FIG. It is explanatory drawing which shows the detail of the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical lens 1b Attachment part 1e Contact surface 1f Adhesive inflow part 3 Lens holding member 3a Recess 3e Wall surface 5 1 liquid thermosetting adhesive 11 Separator lens 11e Attachment part 11h Contact surface 11f Adhesive inflow part 11j 1st 2 Adhesive inflow portion 15 Lens holding member 15b Recess

Claims (4)

In a lens unit formed by adhering an optical lens to a lens holding member with a liquid adhesive,
The lens holding member is formed with a recess for accommodating the mounting portion of the optical lens, and the mounting portion of the optical lens is formed to fit into the recess, and is formed on the wall surface of the recess of the mounting portion. A lens unit, wherein a groove-like adhesive inflow portion into which the adhesive can easily flow is formed on the abutting surface. The lens unit according to claim 1, wherein
The adhesive is made of a one-component thermosetting adhesive, and the gap between the abutting surface and the wall surface is dimensioned so that the separation liquid of the thermosetting adhesive does not flow. Lens unit to be used. The lens unit according to claim 1, wherein
The adhesive is made of a one-component thermosetting adhesive, and a second adhesive inflow portion is formed at a corner portion of the attachment portion through the abutting surface from the adhesive inflow portion. Lens unit characterized by The lens unit according to any one of claims 1 to 3,
The lens unit according to claim 1, wherein the abutting surface is a positioning reference surface of the optical lens with respect to the lens holding member in a plane perpendicular to the optical axis direction of the optical lens.

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