KR20160071002A - Cover for portable terminal - Google Patents

Abstract

A cover for a portable terminal according to an exemplary embodiment of the present invention includes: a front cover which is disposed on a front surface of the portable terminal having a screen display part; and a rear cover which is disposed on a rear surface of the portable terminal. The front cover includes: an infrared filter part; and a correcting lens part which is disposed on an optical axis of the infrared filter part. Accordingly, a cover for a portable terminal according to the present invention is capable of easily obtaining general images and iris images using an imaging part included in the portable terminal without introducing a separate imaging device.

Description

[0001] COVER FOR PORTABLE TERMINAL [0002]

The present invention relates to a cover for a portable terminal having an iris recognition function.

An iris recognition system with higher security and accuracy than other authentication methods is being used for identity authentication for security access. In this iris recognition system, a characteristic pattern of an iris is acquired from an iris image captured by a camera using an image processing technique, and the iris image is compared with a user's registered iris data to authenticate a specific person.

In recent years, such iris recognition systems have been applied to mobile devices, and their use as personal security systems in everyday life has been increasing.

However, in order to use the iris recognition system, a separate camera system for using iris recognition system other than a camera device for general image shooting is required. This is because an iris recognition camera uses an image of an infrared ray (IR) wavelength band unlike a camera for shooting a general image.

The reason for using IR image for iris recognition is that when a iris image is photographed by an ordinary camera that shoots an image of a general visible light wavelength band, the reflected light reflected by the surrounding objects is formed in the iris region to conceal the iris image, Because it causes degradation.

In addition, even in the case of applying illumination to obtain a clear iris image, the visible light illumination has a disadvantage of causing an uncomfortable feeling by bruising the user's eyes. Therefore, infrared rays are generally used for iris recognition.

Therefore, in order to add the iris recognition function to a mobile device such as a mobile phone, there is a problem of cost and space to additionally install a separate camera using infrared light in addition to a camera device for acquiring a general image.

Embodiments provide a cover for a portable terminal that can use an iris recognition function using a general image capturing camera system.

An embodiment of the present invention provides a portable terminal including a front cover disposed on a front surface of a portable terminal having a screen display unit; And a rear cover disposed on a rear surface of the portable terminal; Wherein the front cover includes an infrared ray filter unit; And a correction lens unit disposed on an optical axis of the infrared filter unit; And a cover for holding the portable terminal.

The front cover may further include a prism optical portion, and the prism optical portion may be disposed apart from the infrared filter portion.

The prism optical unit may be disposed on the optical axis of the light emitting unit included in the portable terminal.

The infrared filter unit and the correction lens unit may be disposed on the optical axis of the imaging unit included in the portable terminal.

The infrared filter unit and the correction lens unit may be disposed apart from each other in the optical axis direction.

The infrared filter unit may be disposed on one side of the front cover adjacent to the screen display unit of the portable terminal, and the correction lens unit may be disposed on the other side of the front cover. At this time, the correction lens unit may have a size enough to cover the infrared filter unit.

The correction lens unit may protrude from the outer surface of the front cover.

The correction lens unit may be disposed on one side of the front cover adjacent to the screen display unit of the portable terminal, and the infrared filter unit may be disposed on the other side of the front cover. At this time, the infrared filter unit may have a size enough to cover the correction lens unit.

In addition, the exposed surface of the infrared filter unit may be disposed on the same straight line as the outer surface of the front cover.

The infrared filter unit and the correction lens unit may be disposed at least 0.1 mm apart.

The correction lens unit may include at least one optical lens.

The portable terminal cover according to the embodiment includes the infrared filter and the auxiliary lens unit so that the iris recognition function can be easily performed at the imaging unit, which is a general image photographing camera, without adding a separate device to the portable terminal.

1 is a view illustrating a cover of a portable terminal according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view of the portable terminal cover embodiment of FIG. 1,
3 is a diagram showing optical characteristics of the infrared filter unit,
4A is a view illustrating a state in which the cover of the portable terminal of the embodiment is opened,
4B is a view illustrating a state in which the cover of the portable terminal of the embodiment is closed,
5 is a detailed view illustrating a closed state of the portable terminal cover according to one embodiment,
6 to 7 are views showing the arrangement of the imaging unit and the cover of the portable terminal of one embodiment,
8A is a view showing the depth of focus in the case where the auxiliary lens portion is not provided,
8B is a view showing the depth of focus when the auxiliary lens unit is included.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

In the description of the embodiment according to the present invention, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) or under are all such that two elements are in direct contact with each other or one or more other elements are indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

Also, the terms "first" and "second", "upper / upper / upper" and "lower / lower / lower" used in the following description are intended to mean any physical or logical relationship or order May be used solely to distinguish one entity or element from another entity or element, without necessarily requiring or implying that such entity or element is a separate entity or element.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

1 is a view showing an embodiment of a portable terminal cover.

For example, the portable terminal cover 200 of FIG. 1 may be a cellular phone cover.

1, the portable terminal cover 200 includes a front cover 210 disposed on a front surface of a portable terminal and a rear cover 250 disposed on a rear surface of the portable terminal. can do.

The front cover 210 may include an IR pass filter unit 110 and a correction lens unit 130.

The front cover 210 covers and protects the screen display unit of the portable terminal.

The front cover 210 may be made of plastic, fabric or leather, but the material of the front cover 210 is not limited thereto.

In addition, the material of the inner cover and the outer surface of the front cover 210, which is one side of the front cover 210 facing the screen display unit, may be different from each other.

The rear cover 250 may be mounted on the rear surface of the portable terminal.

Also, the rear cover 250 may be used as a rear case frame of the portable terminal, as the case may be.

Accordingly, the rear cover 250 can be used to protect the rear surface of the portable terminal or to replace the rear case of the portable terminal.

The material of the rear cover 250 may be plastic, fabric, or leather. However, the material of the rear cover is not limited thereto and may be the same as or different from that of the front cover 210.

The portable terminal cover 200 may further include a coupling portion 230 connecting the front cover 210 and the rear cover 250.

The engaging portion 230 may be integrally formed with the front cover 210.

The coupling part 230 may be formed of a flexible material, for example, a material such as leather, synthetic resin, rubber, or silicone.

1, the front cover 210, the coupling portion 230, and the rear cover 250 are integrally connected to the portable terminal cover 200. However, the present invention is not limited thereto.

For example, the front cover 210 and the rear cover 250 may be separated from each other, and the coupling portion 230 may not be formed at the same height as the front cover 210 and the rear cover 250.

The front cover 210 may include an IR pass filter unit 110 and a correction lens unit 130.

In addition, the front cover 210 may further include a prism optical unit 150.

2 is a cross-sectional view of a front cover 210 cut in a straight line AA 'in the portable terminal cover 200 of FIG.

2, the infrared filter unit 110 and the correction lens unit 130 are disposed on one side of the front cover 210 and the prism optical unit 150 includes the infrared filter unit 110 and the infrared filter unit 110. [ And may be disposed on the other side of the front cover 210 in the horizontal direction with respect to the correction lens unit 130.

The correction lens unit 130 may be disposed on the optical axis y of the infrared ray filter unit 110.

For example, the optical axis of the infrared filter unit 110 and the correction lens unit 130 can be matched.

The infrared filter unit 110 may be a band pass filter unit that blocks light in a visible light region and transmits only infrared light.

3 is a view showing a light transmission wavelength band of the infrared filter unit.

Referring to FIG. 3, the infrared filter unit 110 can transmit light in a wavelength range of 750 nm to 950 nm.

In FIG. 3, the light transmission spectrum shows the incident angle of light at 0 ° and 20 °, respectively, and the pass band of the infrared ray filter unit 110 may be 825 nm to 875 nm.

The auxiliary lens unit 130 disposed on the optical axis of the infrared filter unit 110 may include at least one optical lens.

Referring to FIG. 2, the lens included in the auxiliary lens unit 130 may be a convex lens, but the type and shape of the lens in the embodiment are not limited thereto.

For example, the auxiliary lens unit 130 may include at least one convex lens or a concave lens.

The auxiliary lens unit 130 can change the path of the light reflected from the subject and incident on the lens of the camera serving as the imaging unit.

For example, the light reflected from the subject and incident on the auxiliary lens unit 130 may be refracted according to the arrangement of the auxiliary lens unit 130 and may be incident on the imaging unit of the portable terminal.

In addition, the auxiliary lens unit 130 may function to collimate the light reflected from the subject and transmitted to the image sensing unit.

4A and 4B are views illustrating a portable terminal cover and a portable terminal including the same according to an embodiment of the present invention.

4A is a view illustrating a state in which the cover of the portable terminal of the embodiment mounted on the portable terminal 300 is opened.

The portable terminal 300 shown in FIG. 4A may include an image sensing unit 330 and a light emitting unit 350 at the upper end of the screen display unit 310.

The image pickup unit 330 is a camera system for acquiring images. The camera unit includes an optical unit including a plurality of lenses, an image sensor unit for photoelectrically converting optical information incident on the optical unit into an electrical signal, And the like.

The light emitting unit 350 may be a light emitting diode. For example, the light emitting unit 350 may be a light emitting diode (LED) that emits infrared light.

4A and 4B, the infrared filter unit 110 and the auxiliary lens unit 130 may be disposed in through holes formed in one side of the upper end of the front cover 210 to form one window.

The prism optical unit 150 may also be disposed in another through hole formed in the upper end of the front cover 210. The prism optical unit 150 may be disposed in a horizontal direction with respect to the infrared filter unit 110 and the auxiliary lens unit 130 And can be spaced apart.

The front cover 210 may further include a confirmation window 170 for confirming the contents of the portable terminal display unit 310 even when the cover is closed.

FIG. 4B illustrates a state in which the portable terminal cover is closed. In a state where the portable terminal cover of the embodiment is closed, the infrared filter unit 110 and the auxiliary lens unit 130 may be positioned on the image sensing unit 330 of the portable terminal And the prism optical unit 150 may be disposed on the light emitting unit 350 of the portable terminal.

4B, a window formed on the front cover on which the infrared filter unit 110 and the auxiliary lens unit 130 are disposed on the portable terminal imaging unit 330 has a larger sectional area than that of the imaging unit 330 .

In addition, the window of the front cover, which is disposed on the light emitting portion 350 of the portable terminal and on which the prismatic portion 150 is formed, may have a larger cross sectional area than the light emitting portion 350.

FIG. 5 is a cross-sectional view illustrating the arrangement of the portable terminal cover and the portable terminal of the embodiment with the portable terminal cover closed as shown in FIG. 4B.

5, the infrared filter unit 110 may be disposed on one side of the front cover adjacent to the screen display unit of the portable terminal, and the correction lens unit 130 may be disposed on the other side of the front cover.

That is, in the portable terminal cover of the embodiment, the infrared filter unit 110 and the correction lens unit 130, which are the optical members included in the front cover 210, (110) and the correction lens unit (130).

For example, the lens included in the imaging unit 330 of the portable terminal, the infrared filter unit 110, and the correction lens unit 130 may be disposed on the same optical axis y1.

The prism optical unit 150 may be disposed on the optical axis y2 of the light emitting unit 350 and through the front cover 210. [

The surface 150a facing the subject from the prism optical part 150 may have a curved shape.

The prism optical unit 150 can change the light path so that the light emitted from the light emitting unit 350 can be focused on the object.

That is, the prism optical unit 150 may refract the path of the light emitted from the light emitting unit 350 according to the curvature of the surface 150a to be focused on the subject.

5, the light R1 refracted and emitted from the prism optical unit 150 may be incident on the subject iris.

The light R2 reflected from the subject passes through the correction lens unit 130 and the infrared filter unit 110 and is incident through the lens of the image sensing unit 330 to image an image.

When the infrared filter unit 110 is disposed inside the front cover 210 and the correction lens unit 130 is disposed outside the front cover 210 as in the embodiment shown in FIG. 5, the correction lens unit 130 may have a size enough to cover the infrared ray filter unit 110.

FIG. 6 is a view showing details of a portion D in the embodiment of FIG. 5, and schematically shows the arrangement order and size of the image pickup unit 330, the infrared filter unit 110, and the auxiliary lens unit 130. FIG.

For example, the infrared filter unit 110 may be disposed to cover the lens of the portable terminal imaging unit 330, and the auxiliary lens unit 130 may include an infrared filter unit (not shown) to cover the infrared filter unit 110 110).

W1 <W2 <W3 when the maximum width W1 of the image pickup unit 330, the maximum width W2 of the infrared ray filter unit 110, and the maximum width W3 of the auxiliary lens unit 130 can be set.

5 or 6, the surface 130a of the auxiliary lens unit 130 is positioned on the outer surface of the front cover 210 when the auxiliary lens unit 130 is disposed on the outer side of the front cover 210, As shown in FIG.

5, the correction lens unit 130 may be disposed inside the front cover 210, which is one side of the front cover adjacent to the screen display unit of the portable terminal, and may be disposed on the optical axis of the correction lens unit 130 The infrared filter unit 110 may be disposed outside the front cover 210.

Referring to FIG. 7, the auxiliary lens unit 130 and the infrared ray filter unit 110 may be disposed in order on the optical axis of the portable terminal imaging unit 330.

7, the auxiliary lens unit 130 is arranged to cover the front lens of the portable terminal image pickup unit 330, and the infrared filter unit 110 is disposed on the auxiliary lens unit 130, The auxiliary lens unit 130 may have a larger area than the auxiliary lens unit 130.

That is, W1 <W3 <W2 when the maximum width of the image pickup unit 330 is W1, the maximum width of the infrared ray filter unit 110 is W2, and the maximum width of the auxiliary lens unit 130 is W3.

In addition, when the infrared filter unit 110 is disposed outside the front cover 210, the exposed surface 110a of the infrared filter unit may be disposed on the same line as the outer surface 210a of the front cover.

However, the arrangement of the infrared filter unit 110 is not limited to the embodiment of FIG. 7, and for example, the exposed surface 110a of the infrared filter unit may protrude or be recessed from the outer surface 210a of the front cover It is possible.

In the embodiment of FIG. 6 or 7, the infrared filter unit 110 and the auxiliary lens unit 130 may be disposed apart from each other in the optical axis direction.

For example, the distance d between the infrared filter unit 110 and the auxiliary lens unit 130 may be 0.1 mm or more.

When the infrared ray filter unit 110 and the auxiliary lens unit 130 are disposed at intervals smaller than 0.1 mm, the two optical members may contact each other to form an interference fringe. This can be caused by noise during image acquisition.

Also, if the interval between the infrared filter unit 110 and the auxiliary lens unit 130 increases, the thickness of the front cover 210 including the infrared filter unit 110 and the auxiliary lens unit 130 must be increased, thereby increasing the volume of the portable terminal cover.

Therefore, the arrangement distance d between the infrared ray filter unit 110 and the auxiliary lens unit 130 can be maintained at 1/2 or less of the thickness of the front cover.

Also, the auxiliary lens unit 130 included in the portable terminal cover of the embodiment can change the depth of focus.

8A to 8B are views showing changes in the depth of focus according to the presence or absence of the auxiliary lens unit 130. FIG.

8A shows the depth of focus when the auxiliary lens section is not provided, that is, when the portable terminal cover is removed.

For example, in FIG. 8A, the depth of focus D1 between the front lens 332 included in the portable terminal imaging unit and the subject may be 0.4 m or more. At this time, the image of the subject can be correctly imaged on the image sensor 335 of the imaging unit.

8B is a view showing the depth of focus when the auxiliary lens unit 130 is included, that is, when the portable terminal cover is closed.

8B, the auxiliary lens unit 130 is further included on the optical axis of the imaging unit front lens 332, so that the depth of focus can be changed by the distance between the auxiliary lens unit 130 and the subject.

For example, in the case of further including the correction lens unit 130, the depth of focus D2 can be shortened from 0.15 m to 0.35 m.

Therefore, when using the portable terminal cover of the embodiment and using the imaging unit of the portable terminal with the cover closed, the depth of focus is shortened due to the correction lens unit, and the focus accuracy .

That is, in the case where the iris recognition function is used in the portable terminal, when the camera system which is the imaging unit is used with the portable terminal cover of the embodiment closed, It is possible to increase the accuracy of the iris recognition in the iris recognition method used at a relatively short distance.

In addition, when the portable terminal cover is closed and an image is captured using the imaging unit, only the infrared light can be incident on the imaging unit due to the infrared filter unit, and thus the imaging unit can be suitably used for iris image capturing without using a separate imaging system.

Accordingly, in the case of the portable terminal cover of the above-described embodiment, it is possible to attach the portable terminal cover to the portable terminal and open and close the cover as necessary, thereby realizing iris image capturing for general image capturing and iris recognition without adding a camera system to the portable terminal Lt; / RTI &gt;

For example, for general image capturing, an image can be acquired using a camera system, which is an image capturing unit mounted in a state in which a portable terminal cover is opened.

In addition, in order to capture an iris image, an image of an iris, which is an infrared image, can be obtained by using the same camera system while the portable terminal cover is closed. At this time, if the front cover further includes a confirmation window, the iris image image photographed through the confirmation window can be confirmed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

110: infrared ray filter unit 130: auxiliary lens unit
150: prism optical part 200: portable terminal cover
300: portable terminal 330:
350:

Claims (13)

A front cover disposed on a front surface of a portable terminal having a screen display unit; And
A rear cover disposed on a rear surface of the portable terminal; / RTI &gt;
Wherein the front cover comprises an infrared filter unit; And
A correction lens unit disposed on an optical axis of the infrared filter unit; And a cover for covering the cover. The optical module according to claim 1, wherein the front cover further comprises a prism optical portion,
And the prism optical part is disposed apart from the infrared filter part. The portable terminal cover according to claim 2, wherein the prism optical part is disposed on an optical axis of a light emitting part included in the portable terminal. The portable terminal cover according to claim 1, wherein the infrared filter unit and the correction lens unit are disposed on an optical axis of an imaging unit included in the portable terminal. The portable terminal cover according to claim 4, wherein the infrared filter unit and the correction lens unit are disposed apart from each other in the optical axis direction. The display device according to claim 1, wherein the infrared filter unit is disposed on one side of the front cover adjacent to the screen display unit,
And the correction lens unit is disposed on the other side of the front cover. The portable terminal cover according to claim 6, wherein the correction lens unit has a size capable of covering the infrared filter unit. The mobile terminal cover according to claim 6, wherein the correction lens unit is protruded from the outer surface of the front cover. The image display apparatus according to claim 1, wherein the correction lens unit is disposed on one side of the front cover adjacent to the screen display unit,
And the infrared filter unit is disposed on the other side of the front cover. The portable terminal cover according to claim 9, wherein the infrared filter unit has a size capable of covering the correction lens unit. The portable terminal cover according to claim 9, wherein the exposed surface of the infrared filter unit is disposed on the same straight line as the outer surface of the front cover. The portable terminal cover according to claim 1, wherein the infrared filter unit and the correction lens unit are disposed at least 0.1 mm apart. The portable terminal cover according to claim 1, wherein the correction lens unit includes at least one optical lens.

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