KR20060114869A - Barrel module - Google Patents

Abstract

A barrel module is provided to accurately maintain an air gap between a first lens and a prism by contacting a first lens assembly with the first lens and the prism. A barrel module includes a photoelectric transformation unit which transforms light indicating the image of an object into an electric signal, lens assemblies interposed between the object and the photoelectric transformation unit, and a lens base(200) accommodating the photoelectric transformation unit and the lens assemblies. A first lens assembly(100) of the lens assemblies has a first lens(10) consisting of at least one lens, a first mask installed at the front of the lens positioned most closely to the object, a prism(20) positioned at the rear portion of the first lens to refract the light having passed through the first lens by 90 degrees, a second mask(21) interposed between the farthest lens from the object and the prism and keeping an air gap between the first lens and the prism, a second lens(30) consisting of at least one lens, and a lens barrel for containing the first lens, the first mask, the second mask, and the second lens.

Description

The barrel module

1 is an exploded perspective view showing a lens barrel module according to a preferred embodiment of the present invention.

2 is a cross-sectional view showing a short-side optical path of the barrel module.

3A is a front view of the first lens assembly;

FIG. 3B is a cross-sectional view taken along the line X-X of FIG. 3A.

3C is a cross-sectional view taken along line Y-Y of FIG. 3B.

4 is a front view of the first mask.

5A is a view showing a surface where the second mask is in contact with the prism when viewed from the rear.

Fig. 5B is a view showing a surface of the first lens, when viewed from the front, in contact with a lens that is closer to the subject than the first lens. Fig.

6 is a plan view of the third mask.

7 is a plan view of the fourth mask.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1: lens barrel 10: first lens

11: first mask 12: third mask

20: prism 21: second mask

22: fourth mask 30: second lens

31: fifth mask 100: first lens assembly

120: Second lens assembly 140: Third lens assembly

160: fourth lens assembly 180: fifth lens assembly

200: lens base 300: photoelectric conversion unit

310: Optical low pass filter 320: Charge Coupled Device (CCD)

400, 401: Drive motor assembly X: forward

Y: lateral Z: upward

The present invention relates to a barrel module of a digital image processing apparatus, and more particularly, to a barrel module having a mask for preventing reflection on the inside of the refraction optical system and for seating the prism.

The digital image processing device is a digital still camera (DSC), a digital video camera (DVC), or a digital camera mounted on a mobile phone. Camera and the like.

In recent years, a refractive optical system that uses a prism to refract an optical axis of light representing a subject image in a direction perpendicular to the optical path length from the subject to the CCD in order to realize miniaturization and thinning of the camera is employed.

In the refractive optical system, light incident on the lens is reflected or scattered on each surface of the lens element, the inner wall of the lens barrel, or the inside of the camera body to produce a flare and a ghost image, In color photography, internal reflection occurs which reduces saturation. The inner reflection may occur not only due to abnormal incoming light but also due to normal light entering the outer wall of the lens barrel or scattering due to the lens surface. Therefore, the gap must be blocked and the outer surface of the mask or lens is coated with black paint.

Japanese Patent Application Laid-Open No. 2002-258132 discloses a technique in which a refracting optical system including anti-reflection means with a matte process is employed as a conventional technique. The Japanese Patent Application Laid-open No. 2001-3257 discloses a camera having a refracting optical system including a reflecting means for miniaturization and thinning of a camera, a first lens group in which a light beam is incident and a reflecting means for intercepting unnecessary light rays and forming a good subject image, Reflection means are provided between the reflecting means and the second lens group on which the reflected light is incident.

However, the air gap between the first lens and the prism is determined by the optical required design value, and the first lens and the prism must be physically separated in order to maintain the above gap.

In the case of the above-mentioned Japanese Laid-Open Patent Publication, there is not provided a method of easily and conveniently maintaining a certain air gap between the prism and the first lens. Further, in order to prevent reflection on the inner surface, another antireflective means must be inserted between the first lens and the prism, and then a separate member or a bonding process must be used to mount the prism, and each of the mask and the first lens There has been a problem in that it must be attached by bonding or taping.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a mask which is interposed between a first lens and a prism so as to be in surface contact with each other so as to precisely maintain a required air gap between the first lens and the prism, And it is an object of the present invention to provide a barrel module which does not require a member or a bonding process.

It is also an object of the present invention to provide a barrel module capable of preventing reflection on the inner surface by providing a mask not only between the first lens and the prism but also blocking the unnecessary light traveling in the barrel module.

In order to achieve the above objects and other objects, the present invention provides a photoelectric conversion apparatus comprising: a photoelectric conversion unit for converting light representing an image of a subject into an electrical signal representing an image of a subject; A plurality of lens assemblies arranged between a subject and the photoelectric conversion unit to perform focus adjustment of an object image projected on the photoelectric conversion unit; And a lens base which houses the photoelectric conversion unit and the plurality of lens assemblies.

Wherein the first lens assembly of the plurality of lens assemblies comprises at least one lens and includes a first lens through which light representing an image of a subject passes first; A first mask disposed on a front surface of a lens positioned closest to the subject of the first lens to shield the first and second lenses of the first lens; A prism located behind the first lens and refracting the path of light passing through the first lens by 90 degrees; A second mask interposed between the first lens and the prism so as to make a surface contact between the lens and the prism, the second lens maintaining the air gap between the first lens and the prism and shielding the unnecessary light traveling in the optical path; A second lens made of at least one lens and through which light refracted by 90 degrees in the traveling direction is passed by the prism; And a lens barrel accommodating the first lens, the first mask, the prism, the second mask, and the second lens.

The barrel module comprising: And a third mask positioned below the lens away from the object and blocking a misfire that travels in an undesired optical path of the first lens, and a third mask positioned below the prism, 4 mask. ≪ / RTI >

Here, the thickness of the first mask is determined differently depending on the thickness of the first lens in the front-rear direction of the side surface of the lens away from the subject.

And the fourth mask is formed in a U shape so as to be positioned under the prism.

The outer circumference of the second mask is the same as the outer circumference of the lens of the first lens that is close to the subject, and the first to fifth masks preferably have a matte color.

The prism, the second mask, and the first lens are sequentially brought into surface contact with each other in the forward direction, and then the first lens is attached to the lens barrel by applying an adhesive means thereto.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing a lens barrel module according to a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view showing a short-side optical path of the lens barrel module, FIG. 3a is a front view of the first lens assembly, FIG. 3A is a cross-sectional view taken along line XX of FIG. 3A, and FIG. 3C is a cross-sectional view taken along line YY of FIG.

First, the functions performed by the barrel module according to the preferred embodiment of the present invention will be described with reference to the drawings.

The lens barrel module shown in FIGS. 1 and 2 is a bending type optical system in which light is bent at a right angle by the prism 20 after the light enters the barrel module. The lens barrel module includes a photoelectric conversion unit 300, a plurality of lens assemblies 100, 120, 140, 160, Motor assemblies 400 and 401, and a lens base 200.

The plurality of lens assemblies 100, 120, 140, 160, and 180 include first to fifth lens assemblies and are disposed between the subject and the photoelectric conversion unit 300 to perform zooming and focusing of the image of the subject illuminated on the photoelectric conversion unit 300 .

The photoelectric conversion unit 300 includes an optical low pass filter 310 and a charge coupled device (CCD) 320. The photoelectric conversion unit 300 converts light representing an image of a subject into an image of a subject Into an electrical signal representing

The drive motor assemblies 400 and 401 are used to adjust the zoom and autofocus to a driving source that allows the second lens assembly 120 and the fourth lens assembly 160 to move within the lens base 200 .

The lens base 200 is a case that accommodates the photoelectric conversion unit 300, the plurality of lens assemblies 100, 120, 140, 160, and 180, and the drive motor assemblies 400 and 401.

The plurality of lens assemblies (100, 120, 140, 160, 180) consists of five lens assemblies. The first lens assembly 100 and the third lens assembly 140 and the fifth lens assembly 180 are arranged in a fixed state and the second lens assembly 120 and the fourth lens assembly 160 are disposed in a fixed state, and can be moved at a predetermined distance from the inside of the lens base 200 along two guide bars installed across the inside of the lens base 200 for zooming and auto focusing adjustment. Here, the number of the lens assemblies or the number of lenses in each assembly is not limited to those illustrated in the drawings of the present invention, and may be easily modified by those skilled in the art .

In particular, the first lens assembly 100 includes a lens barrel 1 having a front opening facing the subject and a downward opening at an angle of 90 degrees with the front opening; At least one first lens (10) arranged at the front opening of the lens barrel (1); At least one second lens (30) disposed at a lower opening of the lens barrel (1); And a prism 20 installed in the lens barrel 1 and changing the optical axis by 90 degrees so that the light incident on the first lens 10 is directed to the second lens 30. Thus, the optical axis of the light representing the image of the object is 90 .

The first lens assembly 100 is provided with the first through fifth masks 11, 21, 12, 22, and 31 as described above. The first mask 11 is disposed on the front surface of the first lens 10 and is provided so as to be in surface contact with the lens barrel 1. In the embodiment where the first lens 10 is composed of two lenses, it is preferable that the first lens 10 is disposed in front of the lens located near the subject. The second mask 21 is interposed between the first lens 10 and the prism 20 so as to be in surface contact with each other. The hatched portion 21a in FIG. 5A indicates a portion where the second mask 21 contacts the prism 20, and the hatched portion 21b in FIG. 5B indicates that the second mask 21 is in contact with the prism 20. [ (10). In the embodiment in which the first lens 10 is composed of two lenses, it is preferable to interpose the first mask 11 between the prism 20 and the lens far from the subject in the first lens 10. It is preferable that the thickness of the second mask 21 is determined differently depending on the thickness of the side surface of the lens of the first lens 10 that is far from the subject. This is because the air gap between the first lens 10 and the prism 20 is determined according to the optical design value and therefore the distance between the first lens 10 and the prism 20 depends on the thickness of the first lens 10, This is because the thickness is determined. The third mask 12 is disposed under the first lens 10 and is provided so as to be in contact with the lens barrel 1. In the embodiment in which the first lens 10 is composed of two lenses, it is preferable to dispose the first mask 11 under the lens of the first lens 10 which is far from the subject. The fourth mask 22 has a polygonal shape and is provided so as to be in surface contact with the bottom surface of the prism 20. The fifth mask 31 is provided so as to be in surface contact with the lens barrel 1 that supports the second lens 30 on the bottom surface of the second lens 30. In the embodiment in which the second lens 30 is composed of two lenses, it is preferable to interpose the fifth mask 31 on the bottom surface of the lens of the second lens 30 which is close to the prism 20. Here, the first to fifth masks 11, 21, 12, 22, and 31 block the misfire entering through the gap and prevent the light from being scattered or reflected by the surface of the lens, .

Figure 4 shows a first mask. Since the first mask 11 should block the misfire entering beyond the effective diameter of the first lens 10, the size of the inner circumference should be determined in consideration of the effective diameter of the first lens 10, 1 < / RTI > lens 10 and can be accurately attached to the bend of the lens barrel 1. As shown in Fig.

5A is a view showing a surface in which the second mask 21 is in contact with the prism 20 when viewed from the rear, and FIG. 5B is a view showing a state in which the second mask 21 is in contact with the first lens 10 Fig. 5 is a view showing a surface contacting with a lens which is close to the subject. Fig. 5A shows a portion where the second mask 21 makes contact with the prism 20, and a hatched portion in FIG. 5B shows a portion where the second mask 21 makes contact with the first lens 10 . The size of the outer circumference (short side and long side) of the second mask 21 is preferably coincident with the outer circumference of the first lens 10, It is preferable that the upper surface and both side surfaces of the prism 20 are covered so as to cover the upper surface and both side surfaces of the prism 20 in order to shield the misfit light coming from the effective diameter of the prism 20.

Fig. 6 is a plan view of the third mask 12, and Fig. 7 is a plan view of the fourth mask 22. Fig. As shown in FIG. 6, it is preferable that the third mask 12 is formed so that the edges thereof are slightly cut, and are entirely rectangular, to coincide with the area of the bottom surface of the first lens 10. As shown in Fig. 6, Fig. 6 is positioned in a U-shape below the edge portion of three of the bottom surface portions of the prism 20 and is in surface contact with the lens barrel 1. Fig.

If the second lens 30 is assembled on the lower surface of the lens barrel 1, the lens barrel 1 is fixed by using an adhesive, The prism 20 is inserted into the lens barrel 1.

   Next, a fourth mask 22 that is not tapered is inserted into the lower part of the prism 1, the second mask 21 is placed on the prism 1, and then the first lens 10 is placed in front of the second mask 21 And a third mask 12 which is not taped is attached to the bottom surface of the first lens 10 which is a decut portion of the first lens 10 after the first lens 10 is fixed by using an adhesive And the first mask 11 is attached to the barrel on the side of the first lens 10 by taping. Here, since the fifth mask 31 is attached on the second lens 30 by being tapped on the second lens 30, it is only necessary to attach the second lens 30 to the lower surface of the lens barrel 1.

Since detailed configurations of the second through fifth lens assemblies 120, 140, 160, and 180 are not characteristic contents of the present invention, detailed description thereof will be omitted.

Next, functions and actions of the lens barrel module according to the preferred embodiment of the present invention will be described.

The lens barrel module according to the embodiment of the present invention is constituted by a bending optical system in which the optical axis is bent at a right angle by the prism 20 after light enters the barrel module. That is, the light incident through the first lens 10 of the first lens assembly is converted into an optical axis by the prism 20 by 90 degrees, and is incident on the second lens assembly 120 through the second lens 30. The incident light is incident on the photoelectric conversion unit 300 while the focus is adjusted by the movement of the second lens assembly 120 and the fourth lens assembly 160. That is, by configuring the optical axis to be bent in the direction of 90 degrees, it is not necessary to arrange all the lenses in the direction in which the light is incident, and the thickness in the longitudinal direction of the digital image processing apparatus can be greatly reduced.

In this bending type optical system, a mask is interposed so as to block the light coming in from above the effective diameter and the common light coming in through the gap and blocking the unwanted light traveling in the undesired path so that the image of the object can be accurately formed on the CCD without inner reflection. Referring to FIGS. 2, 3B and 3C, the misfit entering beyond the effective diameter of the first lens 10 is blocked by the first mask 11 attached to the front of the first lens 10.

3B, if the third mask 12 is not provided, a gap may be formed between the second mask 21 and the lens barrel 1 through the first lens 10 When light rays enter the second lens 30 directly without being reflected by the prism 20, inner surface reflection may occur. The third mask 12 is disposed below the first lens 10 and is in surface contact with the lens barrel 1 in order to shield the misfire that proceeds to the undesired optical path. At this time, even if there is a gap in the vertical direction between the second mask 21 and the lens barrel 1, light is blocked by the structure of the lens barrel 1 in the upper surface portion of the first lens 10, The mask of FIG.

It must be maintained between the first lens 10 and the prism 20 in order to satisfy the optical design value required for the light incident through the first lens 10 to be accurately focused on the CCD 320 through the prism 20 Is determined. The second mask 21 having a necessary thickness in order to maintain the required air gap, the first lens 10 than the first surface long side at the side of the lens 10 in contact with and be disposed so as to contact side prism 20 transient prism ( 20 to prevent unwanted emission of light. Therefore, the surface of the prism 20, the first mask 11, and the first lens 10 are brought into surface contact with each other in order to mount the prism 20 or the first lens 10 without any additional member or bonding Only the outer diameter portion of the first lens 10 is fixed by bonding and thereby the required air gap between the prism 20 and the first lens 10 can be accurately maintained and the misfire that causes inner surface reflection can be blocked.

There is a spot of light that is refracted at 90 degrees through the prism 20 to enter an unnecessary optical path beyond the effective diameter of the prism 20, Is blocked by the fourth mask (22) and the reflection on the inner surface is prevented. At this time, as shown in the drawing, it is preferable that the open portion of the mask having a convex shape is the front side. This is because the incident light is blocked by the first mask 11 and the third mask 12 on the front side.

The light refracted through the prism 20 passes through the second lens 30. The light entering the second lens 30 beyond the effective diameter of the second lens 30 passes through the fifth lens And is cut off by the mask 31. The light incident through the first lens assembly 100 as described above is incident on the third lens assembly 140 and the third lens assembly 140 by zooming and autofocusing between the second lens assembly 120 and the fourth lens assembly 160. [ 5 lens assembly 180 to form an image.

According to the lens barrel module of the present invention, the first lens assembly is provided, which includes a second mask interposed between the first lens and the prism so as to be in surface contact with each other, and whose thickness is determined according to the thickness of the first lens.

Thus, the first mask accurately maintains the air gap between the first lens and the prism due to the optical design value, so that the image of the subject can be accurately formed on the CCD.

Secondly, since only the outer diameter portion of the first lens is brought into surface contact with the prism, the second mask and the first lens in this order, a separate member or bonding step is not required for the mounting of the prism, Can be saved.

Third, a first mask provided on the front surface of the first lens, a second mask interposed between the first lens and the prism interposed so as to face each other between the first lens and the prism, a third mask provided below the first lens, The fourth mask provided below the prism, and the fifth mask provided so as to be in surface contact with the lens barrel supporting the second lens, thereby preventing the inner reflection.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (9)

A photoelectric conversion unit for converting light representing an image of a subject into an electrical signal representing an image of the subject; A plurality of lens assemblies arranged between a subject and the photoelectric conversion unit to perform focus adjustment of an object image projected on the photoelectric conversion unit; And And a lens base accommodating the plurality of lens assemblies, Wherein the first lens assembly of the plurality of lens assemblies comprises: A first lens which is made up of at least one lens and through which light representing an image of a subject passes first; A first mask disposed on a front surface of a lens positioned closest to the subject of the first lens to shield the first and second lenses of the first lens; A prism located behind the first lens and refracting the path of light passing through the first lens by 90 degrees; A second mask interposed between the first lens and the prism so as to make a surface contact between the lens and the prism, the second lens maintaining the air gap between the first lens and the prism and shielding the unnecessary light traveling in the optical path; A second lens made of at least one lens and through which light refracted by the prism in a progressing direction of 90 degrees passes; And a lens barrel for accommodating the first lens, the first mask, the prism, the second mask, and the second lens. The method according to claim 1, Wherein the thickness of the first mask is determined differently in accordance with the thickness of the side surface of the lens far from the subject in the longitudinal direction of the first lens. 3. The method of claim 2, And a third mask positioned below the lens away from the object of the first lens and blocking the unnecessary light traveling through the optical path. The method of claim 3, And a fourth mask positioned below the prism and blocking the misfire that proceeds to an undesired optical path. 5. The method of claim 4, And the fourth mask has a U-shape to be positioned below the prism. 6. The method of claim 5, Further comprising a fifth mask positioned to be in surface contact with a lens barrel supporting the second lens at a bottom surface of the second lens, the fifth mask interrupting the unnecessary light traveling in the optical path. The method according to claim 6, And the outer circumference of the second mask is the same as the outer circumference of the lens of the first lens that is closer to the subject. 8. The method of claim 7, Wherein the first to fifth masks have a matte color. 9. The method according to any one of claims 1 to 8, Wherein the prism, the second mask, and the first lens are sequentially brought into surface contact with each other in a frontward direction, and then the adhesive is applied to the first lens to be coupled to the lens barrel.

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