CN112703110B

CN112703110B - Back cover for portable terminal

Info

Publication number: CN112703110B
Application number: CN201980059681.XA
Authority: CN
Inventors: 朴声澈; 金银锡; 吴仁焕
Original assignee: Hanjiao Hologram Co
Current assignee: Hanjiao Hologram Co
Priority date: 2018-09-11
Filing date: 2019-09-11
Publication date: 2022-12-13
Anticipated expiration: 2039-09-11
Also published as: KR102372306B1; WO2020055157A1; KR20200030020A; CN112703110A

Abstract

The present invention relates to a back cover for a portable terminal, comprising: a rear case made of a transparent material; a hologram part on the rear case for outputting a hologram image; and a protective layer located at the hologram portion.

Description

Back cover for portable terminal

Technical Field

The present invention relates to a back cover for a portable terminal, and to a back cover for a portable terminal having a volume hologram film (volume film).

Background

Hologram (Hologram) refers to a technique for drawing a three-dimensional solid on a two-dimensional plane with a laser beam.

Such a hologram displays a three-dimensional image by storing recording information of light generated by an interference effect of one or more laser beams on a hologram recording material such as a photopolymer (photopolymer) or a Silver halide film (Silver halide).

Thus, the information stored in the two-dimensional recording material is displayed as a three-dimensional image based on the recording information of the light stored in the recording material.

Such holograms can be widely used for credit card anti-counterfeiting purposes or as storage media.

An example of a case where such a hologram is used is as follows.

First, korean patent No. 10-0582842 (grant date: 2006, 05, 17) discloses a "method of manufacturing a packaging film having a hologram formed thereon and a packaging box". In this patent, a method of providing a packaging film by forming a hologram on a base film as a base material of a packaged product is disclosed.

Further, korean granted patent No. 10-0710893 (granted date: 04/17/2007) discloses a "method of bonding a synthetic resin film formed with a hologram to a polypropylene sheet". In this patent, an optically enhanced hologram sheet is provided by bonding a synthetic resin film such as a stretched polypropylene film or the like to a polypropylene sheet.

Documents of the prior art

Patent document

Korean granted patent No. 10-0582842 (granted date: 2006, 05 and 17)

Korean granted patent No. 10-0710893 (granted date: 2007, 04, month 17)

Disclosure of Invention

Problems to be solved

The invention provides a rear cover for a portable terminal using a hologram part.

Another problem to be solved by the present invention is to improve the aesthetic appearance of a portable terminal.

Means for solving the problems

The back cover for a portable terminal of the present invention for solving the above problems includes: a rear case made of a transparent material; a hologram part on the rear case for outputting a hologram image; and a protective layer located at the hologram portion.

The hologram image may be a volume hologram image.

The protective layer may be made of Polycarbonate (PC), polyethylene terephthalate (PET), triacetyl cellulose (TAC), or a silicon-based material.

The rear cover for a portable terminal according to the above feature may further include: a first adhesive layer between the rear case and the hologram part; and a second adhesive layer between the hologram part and the protective layer.

The thickness from the first adhesive layer to the protective layer may be 50 \13211; to 200 \13211;.

The rear cover for a portable terminal according to the above feature may further include a pattern part between the hologram part and the protective layer.

The pattern part may include: a base layer for a pattern on the hologram section; a primer layer in contact with the base layer for pattern; and a pattern layer in contact with the primer layer.

The rear cover for a portable terminal according to the above feature may further include: a first adhesive layer between the rear case and the hologram part; a second adhesive layer between the pattern part and the protective layer; and a third adhesive layer between the hologram part and the pattern part.

The pattern part may include: a primer layer in contact with the hologram portion; and a pattern layer in contact with the primer layer.

The rear cover for a portable terminal according to the above feature may further include: a first adhesive layer between the rear case and the hologram part; and a second adhesive layer between the pattern part and the protective layer.

The rear cover for a portable terminal according to a feature of the present invention includes: a rear housing; a first protective layer on the rear housing; a hologram section on the first protective layer and outputting a hologram image; a pattern part located at the hologram part; and a second protective layer on the pattern portion.

The hologram image may be a volume hologram image.

The pattern part may include: a base layer for a pattern on the hologram section; a pattern layer on the base layer for pattern; and a first adhesive film between the base layer for a pattern and the pattern layer.

ADVANTAGEOUS EFFECTS OF INVENTION

According to this feature, since the hologram image is outputted from the rear cover of the portable terminal to the outside, the aesthetic appearance of the rear cover of the portable terminal is greatly improved, and the appearance of the portable terminal is also improved, thereby increasing the end of the portable terminal. In particular, since the hologram image is a volume hologram image, the stereoscopic impression of the hologram image displayed from the rear cover of the portable terminal is further improved.

In addition, the mobile phone shell drawn with various patterns or pictures does not need to be purchased additionally, so that the cost for purchasing the mobile phone shell additionally is reduced.

In addition to this, the risk of damage or breakage caused by inflow of foreign matter into the hologram portion or external impact is greatly reduced by the protective layer on the hologram portion.

Therefore, the lifetime of the hologram portion located at the rear cover of the portable terminal is increased and the inflow of foreign substances is reduced, thereby reducing the concern that the resolution of the hologram image output from the rear cover of the portable terminal to the outside is reduced.

In addition, the aesthetic sense of the hologram image outputted from the hologram part is further improved by the pattern layer positioned on the hologram part, thereby increasing user satisfaction and greatly improving the high-end of the portable terminal.

Drawings

Fig. 1 is a sectional view of a rear cover for a portable terminal according to an embodiment of the present invention.

Fig. 2 is a diagram conceptually illustrating an example of a manufacturing apparatus for a hologram portion of a hologram sheet according to an embodiment of the present invention.

Fig. 3 is a diagram conceptually illustrating another example of a manufacturing apparatus for a hologram portion of a hologram sheet according to an embodiment of the present invention.

Fig. 4 is a sectional view of a rear cover for a portable terminal according to another embodiment of the present invention.

Fig. 5 is a sectional view of a rear cover for a portable terminal according to still another embodiment of the present invention.

Fig. 6 is a sectional view of a rear cover for a portable terminal according to still another embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is judged that the technical matters known in the art or the constitution added with the detailed description may make the gist of the present invention unclear, a part thereof is omitted in the detailed description. In addition, the terms used in the present specification are terms used to properly represent the embodiments of the present invention, which may be changed by a person or a common practice related to the art, and the like. Therefore, the definitions of these terms should be given based on the entire specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The term "comprising" as used in the specification is intended to specify the presence of particular features, regions, integers, steps, actions, elements, and/or components, but does not exclude the presence or addition of other particular features, regions, integers, steps, actions, elements, components, and/or groups thereof.

Hereinafter, a rear cover for a portable terminal according to an embodiment of the present invention is described with reference to fig. 1.

Referring to fig. 1, a back cover 1 for a portable terminal according to an embodiment of the present invention has: a rear case 110 of the portable terminal; a hologram part 120 on the rear case 110; a protective layer 130 on the hologram part 120; a first adhesive layer 1201 between the rear case 110 and the hologram part 120; and a second adhesive layer 1202 between the hologram portion 120 and the protective layer 130.

The rear case 110 is a case located on the rear surface side of the portable terminal (not shown), and the exposed surface thereof constitutes an outer surface directly contacting the outside. Accordingly, the Rear case 110 forms a part of a Rear cover (real case) of the portable terminal by being attached to the Rear surface of the portable terminal.

At this time, the portable terminal may be a terminal implementing the fifth generation mobile communication 5G, and thus, the rear case 110 may be made of a transparent material such as glass or plastic that does not affect transmission and reception of communication signals.

The hologram unit 120, which is attached to one surface of the rear case 110, i.e., to a non-exposed surface not exposed to the outside, stores hologram information.

Such a hologram 120 has a substrate 121 and a photosensitive layer 122 on the corresponding side of the substrate 121.

As shown in fig. 1, the hologram part 120 is in contact with the corresponding face of the rear case 110, and the photosensitive layer 122 is in contact with the corresponding face of the rear case 110.

The substrate 121 of the hologram part 120 may be made of a transparent or opaque material, for example, polycarbonate (PC), polyethylene terephthalate (PET), triacetylcellulose (TAC), or a silicon-based material.

In this example, substrate 121 may have a thickness of 10 \13211; to 200 \13211;. The photosensitive layer 122 located on the substrate 121 is made of a material for recording a hologram image, and as a portion in which the hologram image is stored, the hologram image stored in the photosensitive layer 122 of the present example may be a volume hologram (volume hologram) image.

The photosensitive layer 122 may be made of photopolymer (photopolymer) of photosensitive recording material, silver halide (silver halide), or the like.

As described above, the hologram unit 120 used in this example is a volume hologram unit storing a volume hologram image, and records an image of a desired object in a three-dimensional (3D) hologram by irradiating a laser beam onto the photosensitive layer 122 made of photopolymer or silver halide.

Such a volume hologram 120 is classified into a transmission type and a reflection type according to a production method of recording a three-dimensional image using a change in an internal refractive index, rather than recording information by surface unevenness.

The transmission type is called a Fresnel hologram (Fresnel hologram) type, and the hologram portion 120 of the transmission type can be manufactured by a manufacturing apparatus shown in fig. 2.

That is, as shown in fig. 2, the manufacturing apparatus for manufacturing the volume hologram 120 by the transmission method includes: at least one laser beam irradiation section 211-213 that outputs a laser beam (laser beam) of a prescribed color [ red (R), green (G), or blue (B) ]; a plurality of first reflecting mirrors (mirrors) 2211 to 2213 positioned in front of the respective laser beam irradiating sections 211 to 213; a shutter (shutter) 230 positioned in front of the first mirrors 2211-2213; a beam splitter (beam splitter) 240 located in front of the shutter 230 and reflecting only the corresponding laser light; a second mirror 222 located at a position of the first direction in front of the beam splitter 240; a third reflecting mirror 223 positioned in front of the second reflecting mirror 222; a first spatial filter 251 located in front of the third mirror 223; a fourth mirror 224 located at a position in the second direction (i.e., a direction perpendicularly intersecting the first direction) in front of the beam splitter 240; and a second spatial filter 252 positioned in front of the fourth mirror 224.

In this case, a blank hologram portion 120a for storing an image of the object 500 is provided in front of the first spatial filter 251, and an object 500 to be stored in the blank hologram portion 120a is provided in front of the second spatial filter 252.

Here, the blank hologram unit 120a is an empty hologram unit in which no hologram image is stored, and the blank hologram unit 120a also includes a substrate 121 and a photosensitive layer 122a which is a portion for storing a hologram image.

Therefore, the laser beams of the respective colors are irradiated from the respective laser beam irradiation portions 211 to 213 to the respective first reflection mirrors 2211 to 2113, and the first reflection mirrors 2211 to 2213 reflect the irradiated laser beams to the shutter 230 side.

At this time, since the plurality of first reflecting mirrors 2211 to 2213 are positioned on the same horizontal line, the lights reflected by the respective reflecting mirrors 2211 to 2213 are mixed with each other into a mixed laser beam and incident on the shutter 230 side.

Although three laser beam irradiation portions 211 to 213 that respectively irradiate laser beams of respective colors (i.e., red, green, and blue) are shown in fig. 2, as described above, only one or two laser beam irradiation portions 211 to 213 may be provided or only at least one laser beam irradiation portion 211 to 213 may be driven to output a desired laser beam of a respective color to the respective first reflection mirrors 2211 to 2213 side. The shutter 230 operates in accordance with an external control operation, and outputs the laser beam reflected by the first mirrors 2211 to 2213 to the beam splitter 240 side, and the beam splitter 240 splits the laser beam output from the shutter 230 into two beams and outputs the two beams in the first direction and the second direction.

At this time, the laser beam outputted to the second mirror 222 side in the first direction becomes a reference beam (reference beam), and the laser beam outputted to the fourth mirror 224 side in the second direction becomes an object beam (object beam) irradiated to the object 500 side.

The second mirror 222 reflects the reference beam output in the first direction to the third mirror 223 side, and the third mirror 223 reflects the incident reference beam to the spatial filter 251 side.

Therefore, the spatial filter 251 selects a spatial frequency component from the incident reference beam and outputs the selected spatial frequency component, thereby converting the incident reference beam into diffused light and irradiating the diffused light to the blank hologram unit 120a side.

The object beam output in the second direction from the beam splitter 240 enters the fourth mirror 224 and is reflected by the fourth mirror 224 to the second spatial filter 252.

Therefore, the object beam output in the second direction is converted into diffused light by the second spatial filter 252 and is irradiated to the object 500 side.

Thus, the reference beam reflected by the object 500 and the object beam output from the first spatial filter 251 interfere with each other to form an interference pattern, and are stored in the photosensitive layer 122a of the blank hologram unit 120a, so that a hologram image of the object 500 is stored in the photosensitive layer 122a, thereby completing the hologram unit 120 of the present example.

The hologram unit 120 produced by this production apparatus will be a transmission volume hologram unit.

Next, a mode of producing the reflection type volume hologram unit 120 will be described with reference to fig. 3.

As shown in fig. 3, the apparatus for manufacturing the reflection type volume hologram 120 includes: laser beam irradiation sections 311 to 313 that output laser beams of respective colors (R, G, B), respectively; a plurality of reflecting mirrors 321 to 323 reflecting the laser beams output from the respective corresponding laser beam irradiation sections 311 to 313; a shutter 330 positioned in front of the plurality of mirrors 321-323; and a spatial filter 340 positioned in front of the shutter 330.

In the present apparatus, a blank hologram unit 120a is provided in front of the spatial filter 340, and an object 500 is provided on the back side of the blank hologram unit 120 a.

The mirrors 321-323 are dichroic mirrors (dichroic mirrors), and the spatial filter 340 has a lens and a pin hole (pin hole), and the like.

In the manufacturing apparatus of such a configuration, first, when laser beams of respective colors are output from the respective laser beam irradiation sections 311 to 313, the respective reflecting mirrors 321 to 323 provided corresponding to the respective laser beam irradiation sections 311 to 313 reflect the stress beams to the shutter 330 side.

At this time, as shown in fig. 3, since the plurality of mirrors 321 to 323 are positioned on the same horizontal line, the lights reflected by the respective mirrors 321 to 323 are mixed with each other into a mixed laser beam and incident on the shutter 330 side.

The mixed laser beam incident on the shutter 330 side is output to the spatial filter 340 side by the opening operation of the shutter 330, and the laser beam filtered into a diffused beam form by the spatial filter 340 by the operation of the spatial filter 340 is irradiated to the blank hologram unit 120 a. At this time, the diffused beam output from the spatial filter 340 becomes a reference beam.

The diffused light beam irradiated to the blank hologram unit 120a passes through the blank hologram unit 120a, is output to the object 500 side, and is reflected by the object 500.

Therefore, the reflected light beam reflected by the object 500 enters the blank hologram unit 120a again. At this time, the reflected light beam reflected by the object 500 becomes an object light beam.

As described above, since both the reference beam output from the spatial filter 340 and the object beam reflected by the object 500 are directed to the blank hologram 120a side, an interference pattern generated by interference of the reference beam and the object beam is recorded in the photosensitive layer 122a of the blank hologram 120a, and image information on the object 500 is stored in the photosensitive layer 122a. Thereby, the volume hologram unit 120 of the present example is completed.

The hologram portion 120 of the present example produced by this production apparatus is a reflection type volume hologram portion.

As described above, the hologram unit 120 of the present example may use a reflection type volume hologram unit or a transmission type volume hologram unit.

The exposed surface of the protective layer 130 on the upper surface of the substrate 121 of the hologram section 120, which is a portion that contacts the main body (e.g., main circuit board) of the portable terminal, may be made of a transparent material in order to protect the hologram section 120 located at the lower portion from foreign substances such as moisture and dust flowing in from the main body of the portable terminal.

Such a protective layer 130 is made of, for example, polycarbonate (PC), polyethylene terephthalate (PET), triacetyl cellulose (TAC), or a silicon-based material and may have a thickness of 20 \13211; -500 \, 13211;, or more.

In this example, although the protective layer 130 is a single-layer structure of one-layer structure, it is not limited thereto, and may be a multi-layer structure of two or more layers made of different materials.

In this example, in order to adhere the hologram portion 120 and the rear case 110 at the lower portion thereof to each other, and in order to adhere the hologram portion 120 and the protective layer 130 at the upper portion thereof to each other, a first adhesive layer 1201 and a second adhesive layer 1202 are provided therebetween.

These

adhesive layers

1201 and 1202 are layers formed of an adhesive agent or an adhesive film (for example, an OCA (optical clear adhesive) film or the like) coated on the lower surface and the upper surface of the hologram portion 120, respectively, and may have a thickness of 10 \13211; to 200 \132111;, respectively.

These first adhesive layer 1201 and second adhesive layer 1202 are adhered to the rear case 110 and the protective layer 130 on the lower surface and the upper surface thereof, respectively, by a roller (roller) or physical pressure applied by an operator.

That is, after the rear case 110 is positioned on the lower surface of the hologram part 120 coated with the adhesive or the adhesive film, the rear case 110 is attached to the lower surface of the hologram part 120 by applying a physical force, and then, after the protective layer 130 is positioned on the upper surface of the hologram part 120 coated with the adhesive or the adhesive film, the protective layer 130 is also attached to the upper surface of the hologram part 120 by applying a physical force.

In the portable terminal rear cover 1 having such a structure, a distance from the first adhesive layer 1201 to the upper surface of the uppermost protective layer 130, in addition to the rear case 110, may be 50 \13211; to 200 \13211;.

Since the hologram image recorded in the hologram unit 120 is outputted from the rear cover 1 for a mobile terminal as in this example to the outside, the aesthetic appearance of the rear cover for a mobile terminal is greatly improved, and the appearance of the mobile terminal is also improved, thereby increasing the end of the mobile terminal.

In this case, since the hologram image displayed to the outside by the hologram unit 120 is a volume hologram image having a strong three-dimensional effect, the mobile terminal is further advanced, and the product value of the mobile terminal is greatly improved.

In addition, generally, a rear cover of a portable terminal is mainly a single color such as black, gold, or silver, and thus after a mobile phone case drawn with various patterns or drawings is additionally purchased, the mobile phone case is mounted on the rear cover of the portable terminal.

However, since the rear cover 1 of the portable terminal of the present example has the hologram unit 120 that can output various images, it is not necessary to additionally mount a separate mobile phone case. Therefore, the user can reduce the cost of additionally purchasing the mobile phone shell.

In addition, since the protection layer 130 is positioned above the hologram part 120, the hologram part 120 can be protected from foreign substances and scratches flowing from the main body of the portable terminal.

Therefore, the inflow of dust, moisture, or the like to the hologram portion 120 side is greatly reduced, and the risk of damage or breakage of the hologram portion 120 by external impact or the like is greatly reduced.

Thereby, the lifetime of the hologram part 120 is increased, and a phenomenon in which the definition of the hologram image is reduced due to foreign substances and a phenomenon in which the hologram image is damaged due to scratches are greatly reduced, thereby improving the quality of the hologram image expressed from the hologram part 120.

Next, another embodiment of the present invention will be described with reference to fig. 4.

The same reference numerals as in fig. 1 are given to components having the same configuration and performing the same function as in fig. 1, and detailed description thereof is omitted.

As compared with fig. 1, the rear cover 1a of the portable terminal shown in fig. 4 has, as in fig. 1: a rear case 110; a hologram part 120 on the rear case 110; a protective layer 130 on the hologram part 120; the first adhesive layer 1201 and the second adhesive layer 1202 are disposed between the rear case 110 and the hologram portion 120 and between the hologram portion 120 and the protective layer 130.

Also, the portable terminal of the present example may be a terminal implemented as the fifth generation mobile communication 5G, and thus, the rear case 110 may be made of a transparent material such as glass or plastic that does not affect transmission and reception of communication signals.

In addition to these components 110 to 130, 1201, and 1202, the back cover for a mobile terminal 1a of the present example has a pattern portion 140 located between the hologram portion 120 and the protective layer 130.

The pattern part 140 has a pattern layer 143, and is a portion capable of outputting the pattern printed on the pattern layer 143 to the outside together with the image of the hologram part 120, wherein the pattern layer 143 is formed of a sheet or the like on which a pattern such as various patterns or drawings is printed.

Such a pattern part 140 may have: a pattern base layer 141 on the hologram portion 120; a primer layer (primer layer) 142 on the base layer 141 for pattern; and a pattern layer 143 on the primer layer 142.

The base layer 141 for a pattern on the hologram part 120 serves to support and protect the pattern layer 143, and is made of a transparent material so that the pattern layer 143 can be easily displayed.

The primer layer 142 serves as a layer formed of a primer (primer) applied to a corresponding surface of the base layer 141 for pattern, and serves to bond the base layer 141 for pattern and the pattern layer 143 for pattern.

The primer layer 142 improves the surface uniformity of the pattern base layer 141, thereby improving the adhesive strength with a resin coating layer for imprinting or a sheet printed with a pattern (e.g., the pattern layer 143), thereby protecting the hologram portion (120).

Therefore, the adhesion between the upper pattern layer 143 and the pattern base layer 141 is improved by the primer layer 142, so that the pattern layer 143 can be stably adhered to the pattern base layer 141.

As described above, the pattern layer 143 may be in the shape of a sheet as a layer printed with a pattern such as various patterns or drawings. At this time, a corresponding pattern may be printed on the corresponding sheet or layer using an imprinting process (imprinting) using Ultraviolet (UV).

Accordingly, the pattern layer 143 is formed by bonding the sheet printed with a desired pattern to the pattern base layer 141 with a primer, and the primer layer 142 is interposed between the pattern layer 143 and the pattern base layer 141.

At this time, the hologram unit 120 is located lower than the pattern unit 140, that is, located closer to the outside. Accordingly, the light flowing into the hologram unit 120 from the outside can output the image recorded in the photosensitive layer 122 of the hologram unit 120 to the outside with a somewhat higher degree of clarity.

In this way, since the pattern part 140 on which the pattern is printed is positioned above the hologram part 120 for outputting the image, the hologram image output from the hologram part 120 improves the appearance together with the pattern printed on the pattern part 140, and finally the hologram image information is output to the outside.

Accordingly, the hologram image displayed to the outside together with the image of the pattern part 140 becomes more mysterious and beautiful, thereby improving user satisfaction and upgrading the corresponding portable terminal.

The protective layer 130 positioned on the pattern part 140 is to protect the pattern part 140 from foreign substances flowing in from the main body of the portable terminal, similar to as described above.

In this example, unlike fig. 1, the second adhesive layer 1202 located under the protective layer 130 is for attaching the protective layer 130 and the pattern part 140 to each other.

Further, a third adhesive layer 1501 is provided between the hologram portion 120 and the pattern portion 140, and the third adhesive layer 1501 is formed of an adhesive or an adhesive film applied to the upper surface of the hologram portion 120 and used to attach the pattern portion 140 to the hologram portion 120.

For this, a transparent adhesive or an adhesive film may be coated on the upper surface of the hologram part 120 by an operator or a roller, etc., and the lower surface of the pattern part 140 may be positioned on the upper surface of the hologram part 120 coated with the adhesive or the adhesive film.

Then, when a physical force is applied to the upper surface of the exposed pattern part 140 by a roller, an operator, or the like, the pattern part 140 is adhered to the hologram part 120 positioned therebelow by an adhesive or an adhesive film, and the adhesive or the adhesive film positioned between the hologram part 120 and the pattern part 140 becomes the third adhesive layer 1501.

As described above, in the rear cover 1a for a portable terminal of the present example, the pattern part 200 having the pattern layer 143 is located on the hologram part 100, wherein the hologram part 100 has the hologram part 120 located at the rear case 110.

At this time, the thickness of the hologram portion 100, i.e., the thickness from the first adhesive layer 1201 to the third adhesive layer 1501, may be 50 \13211;, to 200 \13211;, and the total thickness of the pattern portion 200, i.e., the thickness from the lower surface of the pattern portion 140 to the protective layer 130, may be 50 \132111;, to 200 \1321;.

Therefore, as described above, the aesthetic sense of the hologram image output from the hologram unit 120 is further improved by the pattern layer 143, thereby increasing user satisfaction and greatly improving the high-end of the portable terminal.

Next, a back cover 1b for a portable terminal according to still another embodiment of the present invention is explained with reference to fig. 5.

Compared with the back cover 1a for a portable terminal shown in fig. 4, the back cover 1b for a portable terminal of the present example has a hologram portion 100a and a pattern portion 200a having different partial structures from those of the hologram portion 100 and the pattern portion 200 of fig. 4, respectively. Therefore, the same reference numerals as those in fig. 4 are given to the components made of the same material and having the same functions.

That is, as shown in fig. 5, in the hologram portion 100a of the rear cover 1b for a portable terminal of the present example, the protective layer 131 is additionally provided between the rear case 110 and the hologram portion 120, the pattern portion 140a is positioned on the hologram portion 120, and the protective layer 130 is positioned on the pattern portion 140 a.

In addition, the hologram portion 100a has

adhesive layers

1201 and 1501 for adhering portions adjacent to each other and an adhesive film 171.

The adhesive layer 1201 is used to adhere the protective layer 131 and the hologram part 120, the adhesive layer 1501 is used to adhere the hologram part 120 and the pattern part 140a to each other, and the adhesive film 171 is used to adhere the rear case 110 and the hologram part 120.

In addition, the pattern portion 200a has: a pattern base layer 141 attached to the third adhesive layer 1501 positioned at the uppermost portion of the hologram portion 100 a; a pattern layer 143 on the base layer 141 for pattern; and the protective layer 130 is positioned on the pattern layer 143.

At this time, the adhesive film (e.g., a second adhesive film) 172 is positioned between the pattern base layer 141 and the pattern layer 143, and the adhesive layer 1202 is positioned between the pattern part 140a and the protective layer 130.

In the hologram portion 100a, the protective layer 131 located under the hologram portion 120 may be made of Polycarbonate (PC), polyethylene terephthalate (PET), triacetyl cellulose (TAC), or a silicon-based material, and may have a thickness of 20 \13211; -500 \13211;, like the protective layer 130 of fig. 4.

The adhesive film 171 between the rear case 110 and the protective layer 131 for stably attaching the protective layer 131 to the rear case 110 may be formed of a transparent Optical Clear Adhesive (OCA) made of a silicon (Si) -based material.

As described above, since the protective layer 131 is attached to the rear case 110 using the adhesive film 171 without performing an additional adhesive coating work on the corresponding face of the rear case 110, the manufacturing process is easier and simpler, thereby reducing the manufacturing time.

In an alternative example, the

adhesive films

171, 172 may be embodied in a layer shape formed by coating an adhesive or the like, i.e., an adhesive layer, instead of a film.

In addition, in the case of the pattern part 200a, as compared with fig. 4, as described above, the pattern layer 143 is disposed on the base layer 141 for the pattern using the second adhesive film (second adhesive film) 172.

At this time, the second adhesive film 172 is also formed of an optical adhesive film (OCA).

In the case of the present example, although the primer layer 142 shown in fig. 4 is omitted, the primer layer 142 may be used, and in this case, the adhesive film 172 between the base layer 141 for pattern and the pattern layer 143 may be omitted.

In the rear cover 1b for a portable terminal, the hologram portion 100a has a thickness of 10 < lambda > 132111 </lambda > to 200 < lambda > 132111 </lambda >.

In addition, the thickness of the pattern portion 200a is also 10 \13211; 200 \13211;.

Next, a rear cover 1c for a portable terminal according to still another embodiment is explained with reference to fig. 6.

Similarly, as compared with fig. 4, the same reference numerals as in fig. 4 are given to the same components.

In comparing fig. 4 and 6, in the rear cover 1c for a portable terminal shown in fig. 6, the base layer 141 for a pattern of the pattern part 140b is omitted.

Thus, the pattern layer 143 is bonded to the hologram portion 120 through the primer, and thus the pattern portion 140b has the pattern layer 143 and the primer layer 142 between the hologram portion 120 and the pattern layer 143.

Of course, this feature of fig. 6 may also be applied to the example of fig. 5. In this case, if the base layer 141 for a pattern and the adhesive film 172 for adhering the base layer 141 for a pattern and the pattern layer 143 shown in fig. 5 are omitted, the base layer 141 for a pattern and the pattern layer 143 are adhered to each other by a primer.

As described above, since the pattern layer 143 is directly bonded to the hologram portion 120 with the primer, the pattern base layer 141 and the adhesive layer 1501 for bonding the pattern base layer 141 and the hologram portion 120 are omitted.

Therefore, the manufacturing cost and the manufacturing time of the rear cover 1c for the portable terminal are greatly reduced.

Unlike the examples described above, in alternative examples, the

protective layers

130, 131 may be omitted.

In another alternative example, the protective layer 130 and the

pattern parts

140, 140a, and 140b may be attached to each other by an adhesive film.

In the above, the embodiments of the back cover for a portable terminal of the present invention have been explained. The present invention is not limited to the above-described embodiments and drawings, and various modifications and variations can be made from the viewpoint of those skilled in the art. Therefore, the scope of the present invention should be defined by the claims of the present specification and the equivalents of the claims.

Claims

1. A rear cover for a portable terminal, comprising:

a rear case as a case body located on a rear surface side of the portable terminal, made of a transparent material;

a hologram unit on the rear case for outputting a hologram image, the hologram unit having a substrate on one surface of the rear case and a photosensitive layer on the substrate and storing the hologram image;

a pattern part located on the upper part of the hologram part;

a protective layer positioned on the upper portion of the pattern part;

a first adhesive layer formed of a transparent optical film and located between the rear case and the hologram portion;

a second adhesive layer formed of a transparent optical film and located between the pattern portion and the protective layer; and

a third adhesive layer between the hologram part and the pattern part,

the pattern part includes:

a pattern base layer attached to the third adhesive layer and made of a transparent material;

a pattern layer on the base layer for pattern; and

a primer layer or a transparent optical film between the base pattern layer and the pattern layer.

2. The rear cover for a portable terminal according to claim 1,

the hologram image is a volume hologram image.

3. The rear cover for a portable terminal according to claim 1,

the protective layer is made of polycarbonate, polyethylene terephthalate, cellulose triacetate or a silicon-based material.

4. The rear cover for a portable terminal according to claim 1,

the thickness from the first adhesive layer to the protective layer is 50 \13211; to 200 \13211;.