JP2006031029A - Imaging lens assembly equipped with filter lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging lens assembly equipped with a filter lens whose manufacturing process is easy and components are simple and which has wave filtration characteristic absorbing interference spectrum. <P>SOLUTION: The imaging lens assembly is provided with a lens barrel having a holding portion and diaphragm, a first lens installed in the holding portion, and a second lens installed in the holding portion. At least one of either the first lens or the second lens is the filter lens. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging lens assembly, and more particularly to an imaging lens assembly including a filter lens that absorbs an interference spectrum.

  As shown in FIG. 1, the conventional imaging lens assembly 1 includes a lens barrel 11, a first lens 12, a second lens 13, a cut filter 14, an image sensor 15, and a holder 16.

  The lens barrel 11 is connected to the holder 16 and has a housing portion 111 and a diaphragm 112. The first lens 12 and the second lens 13 are provided in the housing portion 111. The cut filter 14 is provided on the holder 16.

  The image sensor 15 is provided on the substrate 17. The substrate 17 is, for example, a printed circuit board or a flexible substrate. The holder 16 is bonded onto the substrate 17.

  The image sensor 15 is, for example, a charge coupled device (CCD) or a complementary metal oxide semiconductor sensor (CMOS), and enters the first lens 12 through the aperture 112. , Provided to detect light rays passing through the second lens 13 and the cut filter 14. The cut filter 14 is provided for cutting an infrared spectrum or an ultraviolet spectrum that interferes with the image sensor 15. Further, the first lens 12 and the second lens 13 may be aspherical lenses formed by plastic injection molding or glass molding, or may be spherical lenses formed by a polishing method.

  However, when the cleanness of the cut filter 14 is not good (for example, fine particles are deposited on the cut filter 14), a part of the light beam is shielded, so that a part of the pixels on the image sensor 15 cannot receive the light beam. , Image quality is affected. Since the cleanliness of the cut filter 14 is required, the manufacturing yield is reduced and the cost is increased. On the other hand, by applying a multi-layered infrared rays filter (Infrared rays filter) to the surface of the lens having a curvature, a supplier aims to improve the manufacturing yield of the imaging lens assembly and reduce the cost. However, there is a problem that it becomes relatively difficult in the process.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging lens assembly including a filter lens having a filtering characteristic that allows easy manufacturing processes, simple parts, and absorption of an interference spectrum. To do.

  In order to achieve the above object, an imaging lens assembly according to the present invention includes a lens barrel having a housing portion and a diaphragm, a first lens provided in the housing portion, and a second lens provided in the housing portion. And at least one of the first lens and the second lens is a filter lens.

  Since the imaging lens assembly according to the present invention includes at least one filter lens capable of absorbing a specific spectrum, in addition to cutting light rays that interfere with the image sensor by this filter lens, a cut filter or multilayer filter is used as compared with the prior art. Since it is not necessary to install a device such as a lens coated with an infrared cut filter, the same effects can be obtained with simpler elements and processes in the manufacturing process and the assembling process, and the number of parts can be reduced.

  Hereinafter, an imaging lens assembly according to a preferred embodiment of the present invention will be described with reference to the drawings. In addition, the description is abbreviate | omitted by attaching | subjecting the same code | symbol about the same components.

  FIG. 2 is a cross-sectional view illustrating an imaging lens assembly in an embodiment according to the present invention. As shown in FIG. 2, the imaging lens assembly 2 in the present embodiment includes a lens barrel 21 having a housing portion 211 and a diaphragm 212, a first lens 22 provided in the housing portion 211, and a housing portion 211. And a second lens 23 provided in the. Note that at least one of the first lens 22 and the second lens 23 is a filter lens.

  The filter lens is a lens that absorbs light of a specific wavelength. In this embodiment, the filter lens is composed of a blue glass composition that absorbs an infrared spectrum and an ultraviolet spectrum. As an imaging principle of the imaging lens assembly, after a light ray enters from the stop 212, it passes through the first lens 22 and the second lens 23, and is finally exposed and imaged by the image sensor 24. Here, the filter lens installed in the imaging lens assembly is used to cut unnecessary light that interferes with the image sensor 24. In this embodiment, the filter lens is, for example, a spherical lens or an aspheric lens. The image sensor 24 is, for example, a charge coupled device (CCD) or a complementary metal oxide semiconductor sensor (CMOS).

  The imaging lens assembly 2 further includes at least one anti-reflection film (Anti-Reflection Coating, AR Coating). These antireflection films are respectively applied to opposite surfaces of the filter lens. In order to prevent reflection, the antireflection film increases the light transmittance of the filter lens and further improves the analysis degree of the optical system.

  In this example, in the filter lens process, the blue glass composition is made of glass, the filter lens is produced by molding or injection molding, and then an antireflection film is applied to both sides of the filter lens facing each other. The production is complete.

  In the present embodiment, the first lens 22 may be a filter lens, and the second lens 23 may be a plastic lens or a glass lens. Conversely, the first lens 22 may be a plastic lens or a glass lens, and the second lens 23 may be a filter lens. Of course, both the first lens 22 and the second lens 23 may be filter lenses. Any combination may be used as long as the interference spectrum can be cut.

  Further, the imaging lens assembly 2 further includes a holder 25. The lens barrel 21 is connected to the holder 25 and combines an image pickup optical system together with the image sensor 24. This imaging optical system can be applied to an imaging module of a mobile phone.

  FIG. 3 is a cross-sectional view illustrating an imaging lens assembly according to another embodiment of the present invention. As shown in FIG. 3, in this embodiment, the imaging lens assembly 2 further includes a third lens 26. The third lens 26 is provided between the first lens 22 and the second lens 23 in the housing portion 211. Note that the third lens 26 is one of a filter lens, a plastic lens, and a glass lens, like the first lens 22 and the second lens 23 described above.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these examples, and design changes and the like within a scope not departing from the gist of the present invention are possible. Even if it exists, it is included in this invention. For example, the imaging lens assembly 2 can further include a fourth lens.

It is sectional drawing which shows the conventional imaging lens assembly. It is sectional drawing which shows the imaging lens assembly in the Example by this invention. It is sectional drawing which shows the imaging lens assembly in another Example by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging lens assembly 11 Lens barrel 111 Housing part 112 Aperture 12 First lens 13 Second lens 14 Cut filter 15 Image sensor 16 Holder 17 Substrate 2 Imaging lens assembly 21 equipped with filter lens Lens barrel 211 Housing part 212 Aperture 22 First 1 lens 23 2nd lens 24 image sensor 25 holder 26 3rd lens

Claims (9)

  An imaging lens assembly comprising: a lens barrel having a housing portion and a diaphragm; a first lens provided in the housing portion; and a second lens provided in the housing portion, wherein the first lens An imaging lens assembly, wherein at least one of the second lenses is a filter lens.   The imaging lens assembly according to claim 1, wherein the filter lens is a lens that absorbs light of a specific wavelength.   The imaging lens assembly according to claim 1, wherein the filter lens is made of a blue glass composition that absorbs an infrared spectrum and an ultraviolet spectrum.   The imaging lens assembly according to claim 3, further comprising at least one antireflection film applied to both opposing surfaces of the filter lens.   The imaging lens assembly according to claim 1, wherein the filter lens is a spherical lens or an aspheric lens.   The imaging lens assembly according to claim 1, wherein the first lens is the filter lens, and the second lens is a plastic lens.   The imaging lens assembly according to claim 1, wherein the first lens is the filter lens, and the second lens is a glass lens.   The imaging lens assembly according to claim 1, further comprising a holder for coupling with the lens barrel.   The imaging lens assembly according to claim 1, further comprising a third lens that is the filter lens and is provided between the first lens and the second lens in the housing portion.

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