JP2003307663A - Lens holder-integrated type lens unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a tray light made incident on a lens holder formed integrally with a lens in a lens holder-integrated type lens unit. <P>SOLUTION: The lens unit 10 is fixed on an imaging device 24 mounted on a base plate by a leg part 16, and the periphery of the unit 10 is covered with a light shielding package 20. The package 20 is fit in the holder 18, and a circular hole 26 is bored at a part covering over the lens 12. The hole 26 functions as the diaphragm of the lens 12. A light shielding slit 14 is formed at the edge of the lens 12, that is, on a boundary between the holder 18 and the lens 12. A light shielding part 15 obtained by casting light shielding resin or light shielding paint in the slit 14 is provided to prevent a situation that the tray light (h) is reflected inside the holder 18 and reaches the imaging device 24, and a flare is caused to lower the contrast of an image. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens unit integrated with a lens holder.

[0002]

2. Description of the Related Art There is a lens unit 100 integrated with a lens holder for a solid-state image sensor as shown in FIG. The lens 102 is provided at the center of the plate-shaped lens holder 108,
The leg portion 106 extending from the lens holder 108 is fixed to the image pickup element 114 on the substrate 112, and the package 110
Is covered by. A hole 116 is formed in the package 110, and light passing through the hole 116 is refracted by the lens 102 and forms an image on the image sensor 114. Since the lens 102 is integrally molded with the lens holder 108, there is no need for optical axis alignment and the number of parts is reduced.

However, the lens holder 108 also has a lens 10
As it is integrally molded with the same transparent material as 2, the stray light is easy to enter, flare increases and the optical performance deteriorates.

To prevent this, the lens 102 and the lens holder 108 may be molded by separate members, and a light-shielding member may be used for the holder. However, since the number of steps is increased, there is no merit of integral molding.

[0005]

In view of the above facts, the present invention has an object to prevent stray light by providing a light-shielding slit in a lens holder when integrally molding a lens holder-integrated lens unit. .

[0006]

According to a first aspect of the present invention, there is provided a lens unit integrated with a lens holder, wherein the lens holder is provided with a light shielding portion for preventing stray light incident on the lens.

In the invention of the above construction, the flare is reduced and the image quality is improved by providing the light-shielding portion for preventing stray light in the lens holder integrally molded with the same transparent material as the lens.

According to a second aspect of the present invention, there is provided a lens unit integrated with a lens holder, characterized in that a light shielding slit is formed by filling a light shielding slit formed at an edge of the lens portion with a colored material. .

In the invention of the above-mentioned structure, the light shielding slit is provided at the edge of the lens portion, that is, the peripheral portion outside the lens portion that does not affect the optical performance, and the light shielding paint or the colored resin is poured into the slit to form the light shielding portion. , Flare is reduced and image quality is improved.

According to a third aspect of the present invention, there is provided a lens holder-integrated lens unit, wherein a projection provided on a package fits into a light shielding slit and functions as a light shielding member.

In the above-described invention, the package serving as the protection member and the light blocking member of the lens unit is provided with the projection, and the projection is fitted into the light blocking slit provided at the edge of the lens portion to function as the light blocking member.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a lens unit integrated with a lens holder according to a first embodiment.

As shown in FIG. 1A, the lens unit 1
Reference numeral 0 denotes a lens 12, a leg portion 16 and a holder 18, and the lens 12 is provided in a convex shape at the center of a plate-shaped holder 18.
Legs 16 extend from the four corners of 8.

In addition, as shown in FIG.
The light-shielding slit 14 is formed at the edge of the, that is, the boundary between the holder 18 and the lens 12.
A light-shielding portion 15 in which a light-shielding resin or a light-shielding paint is poured is provided to prevent stray light.

The lens unit 10 is fixed to an image pickup device 24 mounted on a substrate 22 by a leg portion 16, and the periphery thereof is covered with a light-shielding package 20. Package 20
Is fitted with a holder 18, and a circular hole 26 is formed in a portion covering the lens 12. This hole 26 functions as a diaphragm of the lens 12.

With such a structure, light incident from the outside through the hole 26 is first refracted by the lens 12 and forms an image on the image pickup element 24. The image is photoelectrically converted on the image pickup element 24 and is sent to the substrate 22 as an electric signal.

Here, the effect of the light shielding portion 15 will be specifically described.

As shown in FIG. 2A, when the light shielding portion 15 does not exist, the light h incident at a shallow angle is incident on the lens 1 as an example.
The image sensor 2 refracts at 2 and is reflected at the inside of the leg 16 and the like.
It is possible to reach 4. This light h does not contribute to the image because it is incident from the outside of the angle of view assumed by the combination of the image sensor 24 and the lens 12, and it causes flare and lowers the contrast. This is a cause of deteriorating the image quality of the obtained image.

Therefore, as shown in FIG. 2B, by providing the light shielding portion 15 on the edge of the lens 12, it is possible to prevent the light h incident from outside the angle of view from being irregularly reflected inside the lens unit 10.

Further, at this time, it is desirable that the antireflection coating 30 is applied to a portion other than the surface of the lens 12 of the lens unit 10 as a further countermeasure against stray light.

Further, when the light-shielding resin or the light-shielding paint is poured into the light-shielding slit 14, it may be difficult to sufficiently flow into the light-shielding slit 14 depending on the fluidity of the light-shielding resin or the light-shielding paint. It is better to provide a hole for releasing the filling pressure of the light-shielding resin or the light-shielding paint to the outside.

FIG. 3 shows a lens unit 10 integrated with a lens holder according to the second embodiment.

As a structure of the light-shielding portion 15, a method may be considered in which the light-shielding slit 14 is formed when the lens unit 10 is molded by molding, and a light-shielding resin or a light-shielding paint is poured in later. 3 has a sufficient light-shielding property, the method shown in FIG. 3 may be used.

That is, the projection 32 is provided on the package 20, and the projection 32 is fitted into the light-shielding slit 14 when assembled with the lens unit 10 to form the light-shielding portion 15. In this case, the lens unit 10 and the package 20
Since the assembly of and the formation of the light shielding portion 15 can be performed at the same time,
It is desirable in terms of cost because it reduces the number of assembly steps.

At this time, it is more preferable to taper the protrusion 32 in consideration of the convenience of die cutting and assembling.

FIG. 4 shows a lens unit integrated with a lens holder according to the third embodiment.

The shape of the light-shielding portion is the lens unit 1
When molding 0, as shown in FIG. 4, a single or a plurality of diaphragms 2 are formed in the holder 18 perpendicular to the optical axis direction of the lens 12.
A method of inserting 8 is conceivable. By inserting a plurality of diaphragms 28, the stray light h can be contained in the gap of the diaphragm 28 as shown in FIG. 4, and a higher stray light prevention effect can be expected. Also when forming the diaphragm 28, the lens unit 1
A method of forming slits in the lateral direction when molding 0 and pouring a light-shielding resin or a light-shielding paint is considered.

Further, in the first and third forms, the light shielding portion 15
When forming the, the lens unit 10 with a transparent material,
You may perform by two-color molding which molds the light-shielding part 15 with a light-shielding material.

Further, a method may be used in which the light-shielding portion 15 is first molded and then the light-shielding portion 15 is insert-molded in the lens unit 10.

[0030]

Since the present invention has the above-mentioned structure, it is possible to prevent stray light by providing a light-shielding slit in the lens holder when integrally molding the lens holder-integrated lens unit.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens unit integrated with a lens holder according to a first embodiment.

FIG. 2 is a cross-sectional view of a lens unit integrated with a lens holder according to the first embodiment.

FIG. 3 is a cross-sectional view of a lens holder-integrated lens unit according to a second embodiment.

FIG. 4 is a sectional view of a lens holder-integrated lens unit according to a third embodiment.

FIG. 5 is a cross-sectional view of a conventional lens holder integrated lens unit.

[Explanation of symbols]

10 lens unit 12 lenses 14 Light-shielding slit 15 Light-shielding part 16 legs 18 lens holder 20 packages 22 Substrate 24 Image sensor 26 holes 28 aperture

Claims (3)

[Claims] 1. A lens holder-integrated lens unit, wherein the lens holder is provided with a light-shielding portion for preventing stray light incident on the lens. 2. A lens holder integrated lens unit according to claim 1, wherein a light shielding portion is provided by filling a light shielding slit formed on an edge of the lens portion with a colored material. 3. A lens holder integrated lens unit according to claim 1, wherein a projection provided on the package fits into the light shielding slit and functions as a light shielding member.