KR200437455Y1 - Lens for mobile phone - Google Patents

Abstract

The present invention relates to a lens for a mobile phone camera, and more particularly, a plurality of lenses 20 are sequentially fixed inside the case 10, and an infrared cut filter for filtering infrared rays from the light passing through the lens 20 ( 60) and a lens for a mobile phone camera composed of an image sensor 70 for generating an image by detecting the light passing through the lens 20 and the infrared cut filter 60,

The infrared cut filter 60 is characterized in that disposed between the lens 20,

By placing the infrared cut filter fixed outside the lens between the lenses, it is possible to secure it firmly without a separate fixing device and to reduce the overall TTL naturally. It relates to a lens for a mobile phone camera that causes a useful effect that becomes possible.

Mobile phone, camera, lens. Infrared cut filter.

Description

Lens for mobile phone {Lens for mobile phone}

1 is a cross-sectional view showing a schematic configuration of a conventional lens for a mobile phone camera in a cross-section,

2 is a cross-sectional view showing a schematic configuration of a lens for a mobile phone camera according to the present invention in a cross-section,

3 to 5 is another embodiment showing a schematic configuration of another embodiment of a lens for a mobile phone camera according to the present invention in cross section.

<Explanation of symbols for the main parts of the drawings>

L1, L2,: spacing,

10: case, 20 (20a, 20b, 20c): lens

30, 40: spacer, 50: release prevention ring,

60: infrared cut filter, 70: image sensor.

The present invention relates to a lens for a mobile phone camera, and more particularly, to a lens for a mobile phone camera configured to significantly shorten the total track length (TTL) distance by improving the arrangement of the infrared cut filter (ICF, IC filter). It is about.

In general, a camera mounted on a mobile phone needs to be miniaturized to be suitable for making a mobile phone small and thin. To this end, the lens must be miniaturized, and efforts are being made to this.

The configuration of a lens applied to a camera mounted on a conventional mobile phone devised by the above efforts is shown in FIG. 1. 1 is a cross-sectional view illustrating a schematic configuration of a lens for a conventional mobile phone camera in cross section.

Referring to the drawings, in the conventional lens for a mobile phone camera, the first lens 20a, the second lens 20b, and the third lens 20c are sequentially fixed to the inside of the case 10, and the third lens 20c is fixed. The infrared cut filter 60 and the image sensor 70 are sequentially arranged at a predetermined interval to the rear of the basic configuration.

The first lens 20a serves as an objective lens, and the third lens 20c serves as an alternative lens, and the two lenses 20a and 20c may be used as necessary to control the refraction of light. Multiple lenses may be arranged in between. In general, as described above, the second lens 20b is disposed between the first lens 20a and the third lens 20c to constitute a total of three lenses.

The configuration using a plurality of lenses as described above can be confirmed in Patent Application No. 2003-0029262 "Lens Optical System for Ultra-thin 1 / 4-inch Mobile Phone Camera".

Meanwhile, in order to be used in a camera, an aperture stop is essential, and a washer-shaped spacer 30 serving as an aperture and maintaining a gap between the first lens 20a and the second lens 20b is provided. ) Is provided and arranged. In addition, a spacer 40 in the form of a washer is provided between the second lens 20b and the third lens 20c to maintain the gap therebetween. In addition, the anti-separation ring 50 is provided to be fixed to the case 10 at the rear of the third lens 20c, and through this, three lenses 20 inserted into the case 10 are firmly fixed. .

An infrared cut filter 60 is disposed behind the third lens 20c at a predetermined interval. The infrared cut filter 60 is installed to prevent the infrared rays from entering the image sensor (CCD, photosensitive sensor) 70, which will be described later, is installed at a predetermined interval in front of the image sensor 70 is infrared Will be filtered. The material of the infrared cut filter 60 is made of known glass or synthetic resin capable of blocking infrared rays, and is fixed to the outside of the case 10 by fixing means (not shown).

The image sensor 70 is a sensor for sensing and imaging the light passing through the infrared cut filter 60, and is disposed with a predetermined distance (L2) from the infrared cut filter 60. Here, the distance from the third lens 20c to the image sensor 70 takes into consideration the distance between the parts and the distance of the image (light) passing through the lens 20 as the infrared cut filter 60 is disposed. At least 0.85mm shall be satisfied.

When taking a picture, the image of the object passing through the first lens 20a, the second lens 20b, and the third lens 20c in turn is filtered by the infrared cut filter 60 and then detected by the image sensor 70. It is converted into a digital signal and then displayed on the LCD screen of the mobile phone. The user sees this and takes a picture by manipulating a button at a desired time.

As described above, the conventional lens for a mobile phone camera has revealed a structural problem due to the above configuration.

 As described above, as the infrared cut filter 60 is spaced between the third lens 20c and the image sensor 70 to be fixed at the outside of the case 10, a separate fixing device is required. Therefore, although the adhesive is mainly used for fixing the infrared cut filter 60, the conventional fixing structure with the adhesive had a problem that the adhesive strength is weak and easily broken due to impact or over time. In addition, the problem that the defect rate is high because the foreign matter is likely to enter into the gap between the infrared cut filter 60 and the other adjacent parts.

In addition, the conventional lens for a mobile phone camera as described above, the total length (L1) of the body reaches the image sensor 70 from the front end of the case 10 (this is called TTL. The same below), the lens body Considering the minimum width and thickness needed to secure the device, it was forced to form a mobile phone with a corresponding thickness. That is, the width or thickness of the mobile phone is determined according to the length L1 from the front end of the case 10 to the image sensor 70.

Therefore, in a situation where a smaller and slimmer mobile phone is in the spotlight, the total length of the body without degrading the performance of the lens under conditions in which the components constituting the lens for the mobile phone camera cannot be greatly changed. There was a need to make L1) short and there have been efforts to achieve it. By shortening the length, it can meet the needs of consumers who demand thinner, smaller and lighter mobile phones.

The present invention has been proposed to solve the problems of the conventional mobile phone camera lens as described above, and further improves the reliability of the product by reducing the damage and failure rate by more firmly fixing the infrared cut filter, the camera lens Lenses for mobile phone cameras that enable the manufacture of smaller, thinner and lighter mobile phones by minimizing the thickness or width of the mobile phone required to fix the camera lens by minimizing the size of the lens, especially the total length of the body (TTL). To get that purpose.

In order to achieve the above object, in the present invention, a plurality of lenses sequentially fixed inside the case, an infrared cut filter for filtering infrared light from the light passing through the lens, and the light passing through the lens and the infrared cut filter to detect an image In the lens for a mobile phone camera consisting of an image sensor for generating a,

The lens for a mobile phone camera is characterized in that the infrared cut filter is disposed between the lens.

In addition to the above-described basic configuration, the lens is divided into a first lens serving as an objective lens, a third lens serving as an alternative lens and a second lens disposed between the first lens and the third lens, the infrared blocking The filter may be configured to be disposed between the first lens and the second lens.

In addition, a groove may be provided at the rear of the lens disposed in front of the infrared cut filter to accommodate the infrared cut filter.

And, at least one of the front and rear of the infrared cut filter may be arranged a spacer that serves as an aperture.

In a preferred embodiment of the present invention, when the blocking filter is disposed in the circular groove formed in the rear of the first lens disposed in front, when the spacer is formed on both front and rear of the blocking filter, it is fixed by the separation prevention ring The break filter formed of glass is prevented from being broken.

Hereinafter, the present invention configured as described above will be described in more detail with reference to the accompanying drawings.

Figure 2 is an exemplary cross-sectional view showing a schematic configuration of a lens for a mobile phone camera according to the present invention, Figures 3 to 5 is another cross-sectional view showing a schematic configuration of another embodiment of a lens for a mobile phone camera according to the present invention Examples are also shown.

The case 10 is a camera case for a mobile phone generally seen. Inside the plurality of lenses 20 are fixed in order. The number of lenses 20 can be adjusted as needed, but generally three are arranged. The first lens 20a serving as the objective lens and the third lens 20c serving as the alternative lens, and the second lens 20b disposed between the first lens 20a and the third lens 20c will be.

The infrared cut filter 60 filters infrared rays from the light passing through the lens 20 and is mainly made of glass or plastic.

The image sensor 70 is mounted on a PCB substrate, and detects and passes the infrared light through the infrared cut filter 60 and the lens 20 and the infrared cut filter 60, and then transmits it to the LCD screen of the mobile phone. do.

Here, the function and the material of the lens 20, the infrared cut filter 60, the image sensor 70 as described above is the same as before. In addition, a spacer 30 is disposed between the second lens 20b and the third lens 20c to maintain the gap, and the separation prevention ring 50 is fastened to fix the lens 20 to the case 10. This configuration is also similar to the conventional configuration.

In the present invention, the infrared cut filter 60 is disposed between the lenses 20. In particular, it is preferable to arrange between the first lens 20a and the second lens 20b. Thus, since the lens 20 is disposed between the lenses 20, it can be firmly and firmly fixed without a separate fixing device.

As the infrared cut filter 60 is disposed between the lenses 20 as described above, the image sensor 70 is disposed immediately behind the third lens 20c, and thus the case in which the lens 20 is fixed. From the front end of the (10) to the image sensor 70, the distance (L1), that is, TTL can be made shorter than before.

Shortening as described above is to reduce the distance between the conventional infrared cut filter 60 and the image sensor 70, the distance between the third lens 20c disposed in the rear and the image sensor 70 is reduced. As a result, the overall TTL is reduced to form a short body of the camera lens.

In this case, when the infrared cut filter 60 is disposed between the lenses 20, the infrared cut filter 60 may be formed and arranged to have the same diameter as the lens 20 (FIGS. 2 and 3). A groove in which the infrared cut filter 60 is seated in the center of the lens 20 may be formed, and the infrared cut filter 60 may be configured to be disposed in the space (FIGS. 3 and 4). Otherwise, any structure may be applied as long as the infrared filter 60 is disposed between the lenses 20.

According to the configuration as described above, the total length L1, which is reduced compared to the prior art, has been confirmed to be at least 0.35 mm shorter than the configuration of the lens for a mobile phone camera which is currently generally used. In general, considering that the thickness of the mobile phone is only about 2cm, applying a camera lens according to the present invention as described above will be able to obtain a significant thickness reduction effect.

Meanwhile, in order to use the camera, it is necessary to adjust the amount of light passing through the lens 20 through the aperture. Therefore, the diaphragm should be provided to the main bar, and the spacer 30 capable of performing the diaphragm function may be disposed at the front, the rear, or the front and the rear of the infrared cut filter 60. The spacer 30 is accompanied by the function of maintaining the gap as well as the function of the aperture, and when disposed in both the front and rear, it is preferable that only one of the two is configured to serve as the aperture.

By the configuration as described above it is possible to form a thinner thickness of the lens for the camera applied to the mobile phone, if applied to the mobile phone can be configured to thin and light mobile.

As described above, by placing the infrared cut-off filter between the lenses, it is possible to obtain a firm fixing without a separate fixing device and to reduce the overall TTL naturally. A useful effect is to make the configuration possible.

Claims (4)

A plurality of lenses 20 sequentially fixed inside the case 10, an infrared cut filter 60 that filters infrared light from the light passing through the lens 20, and the lens 20 and the infrared cut filter 60. In the lens for a mobile phone camera consisting of an image sensor 70 for generating an image by detecting the light passing through the, The infrared cut filter 60 is a lens for a mobile phone camera, characterized in that disposed between the lens (20). The method of claim 1, The lens 20 may include a first lens 20a serving as an objective lens, a third lens 20c serving as an alternative lens, and a second disposed between the first lens 20a and the third lens 20c. A lens for a mobile phone camera, which is divided into a lens (20b), wherein the infrared cut filter (60) is disposed between the first lens (20a) and the second lens (20b). The method of claim 2, A lens for a mobile phone camera, characterized in that a groove is provided in the rear of the first lens 20 disposed in front of the infrared cut filter 60 to accommodate the infrared cut filter 60 made of glass. The method of claim 3, wherein The front and rear of the infrared cut filter 60, the spacer 30 is a lens for a mobile phone camera, characterized in that arranged to prevent damage to the infrared cut filter.

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