Computing devices, such as laptop computers, tablet computers, and mobile computing devices, may be configured to be used with various accessory devices, including but not limited to styluses and keyboards.
Examples are disclosed that relate to the use of a microstructured adhesive tape for attaching an accessory device onto a computing device. One example provides a system comprising a computing device and an accessory device mountable to the computing device via a microstructured adhesive tape on one of the computing device and the accessory device, the microstructured adhesive tape configured to adhere to a mating surface on another of the computing device and the accessory device.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure.
As mentioned above, a computing device may be configured to be used with one or more accessory devices. For convenience, some accessory devices, such as a stylus or a keyboard, may be configured to be removably attached to the computing device. For example,
Accessories may be attached to computing devices in various manners. For example, a computing device may include mechanical storage features, such as a slot, hook, clamp, or other connector, configured to receive and retain an accessory such as a stylus. However, the addition of such a storage feature may impact the design and aesthetic appearance of the computing device. Other computing devices may include the use of magnets to retain an accessory device. However, such magnetic attachments may not resist removal by lateral forces, such as those encountered when placing a tablet into a backpack or briefcase. As such, an accessory may be knocked loose by such actions.
Accordingly, examples are disclosed herein that relate to the use of a microstructured adhesive tape for attaching an accessory device onto a computing device. The disclosed microstructured adhesive tape examples may adhere to a surface without the use of conventional adhesive tape coatings, while still providing attachment forces that are sufficiently strong to resist lateral forces. The disclosed microstructured adhesive tape examples further may be cleaned to restore adhesive properties if adhesive performance is impacted by contaminants (e.g. dust, lotions, etc.). In some examples, such microstructured adhesive tapes may be used together with magnets to further help align and keep the accessory device in place on the computing device.
Continuing with
A microstructured adhesive tape is configured to adhere to other surfaces via microscopic structures that are part of the tape, rather than via a layer of an adhesive applied to a tape. For example, a microstructured adhesive tape may include micro-suction cups formed in a component of the tape. The term “micro-suction cups” as used herein may refer to a configuration that allows the tape to adhere to surfaces via suction-like properties when the tape is applied to a suitable surface. As another example, a microstructured tape may include a biomimetic material comprising a plurality of synthetic setae configured to adhere to a surface via dispersive adhesive forces, e.g. van der Waals forces.
One non-limiting example of a suitable microstructured adhesive tape is sold under the name REGABOND-S by EXEL TRADING CO., LTD. This tape includes an acrylic foam material in which the micro-suction cups are formed, a polyethylene terephthalate (PET) film supporting the acrylic foam, and an acrylic adhesive disposed on the another side of the PET film. Table 1 shows technical data of tensile properties for a sample of REGABOND-S. The elongation refers to the increase in length of the material after exposure to a maximum amount of stress the material may withstand before fracture, as a percentage of the original material length. The tensile stress represents a maximum amount of stress the material may withstand before fracture.
Table 2 shows stick strength data for standard samples of REGABOND-S on various materials. Stick strength, also referred to herein as pull force, refers to the strength of force able to be exerted on REGABOND-S while still remaining attached to a tested surface, and in particular, the force needed to detach the sample of REGABOND-S when pulling the tape in a direction normal to the test surface. The presented data is provided by the manufacturer referenced above, and was gathered using laminating a standard REGABOND-S sample on a copper foil, and pressing the sample on each test material surface by a 5 kg/wgt roller. The data was measured while exerting 300 mm/min tensile speed on the sample after 24 hours in standard conditions (i.e. at 23±2° C. and 60±5% relative humidity). The material abbreviations refer to the following: GL for glass, SUS for stainless steel, AL for aluminum, PP for polypropylene, PET for polyethylene terephthalate, and ACL for acrylic.
Table 3 shows shear strength data for a sample of REGABOND-S as measured across varying temperature conditions, as provided by the manufacturer. Shear strength, also referred to herein as shear force with regard to experimental results described below, refers to the force needed to detach a REGABOND-S sample from a test surface when exerting force on the tape in a direction parallel to the plane of the test surface. The REGABOND-S was pressed by a 5 kg/wgt roller onto a test material, and data was measured by exerting 300 mm/min tensile speed after 24 hours for each temperature condition.
Table 4 shows technical data for the micro-suction cup adhesive side of REGABOND-S as provided by the manufacturer. Exhibited force strengths are listed for various materials. The stick strength was again measured by exerting 300 mm/min tensile speed on the sample in standard conditions of 23±2° C. and 60±5%. The shear strength was measured for a 25 mm×25 mm surface area and after loading 1 kg for 2 hours at 40° C. The heat resistance shear strength was measured for a 25 mm×25 mm surface area and after loading 500 g for 2 hours at 90° C.
Table 5 shows durability data of REGABOND-S, as provided by the manufacturer.
−20° C. × 2 H→Normal Condition × 0.5 H
→50° C. 98% RH × 3 H→Normal Condition × 0.5 H
→−20° C. × 2 H→Normal Condition × 0.5 H
→80° C. × 10 H→Normal Condition × 0.5 H
indicates data missing or illegible when filed
In the experiments described below, pull and shear forces, as well as cosmetic changes, were recorded for test samples of REGABOND-S sheets mounted to sample aluminum blocks and tested by adhering to a test glass surface. In the performed experiments, pull force was measured by a load cell while the aluminum block was adhered to the test glass surface and mechanically pulled via an attachment of a clamp in a direction normal to the test glass surface. Shear force was similarly measured, where shear force was exerted on sample aluminum blocks in a direction parallel to the test glass surface. The REGABOND-S sample sheets used were of a thickness of 0.3 millimeters. Table 6 shows a summary of the tests performed on the REGABOND-S samples.
Table 7 summarizes data regarding REGABOND-S samples tested in dust settling experiments. Specifically. Table 7 shows the grab forces (pull and shear forces) measured for REGABOND-S samples initially at “Time 0”, after dust was allowed to settle on the samples at “Time 24”, after brushing off the dust from the samples, and after cleaning the samples with soap and water.
Surface contaminant tests were also performed on REGABOND-S samples to mimic potential exposure to surface contaminants that may occur during actual use of a microstructured adhesive tape. First, a hand lotion (OLAY lotion, available from Procter & Gamble Co. of Cincinnati, Ohio, U.S.A.) was applied on a REGABOND-S sample, and the tape sample was subsequently washed. In another example experiment, petroleum jelly was similarly applied and washed. It was found that the cosmetic appearance of REGABOND-S soiled by the tested surface contaminants may be restored after washing. Additional tests were further performed testing the same surface contaminants in conditions of 60° C. and 65% relative humidity. Again, it was found that the cosmetic appearance of REGABOND-S soiled by the tested surface contaminants may be restored after washing.
The results of the above described experiments indicate that even after repeated uses and with exposure to debris, dust, oils, etc., a portion to all of the initially exhibited adhesive strength of REGABOND-S may be restored by washing the micro-suction cup surface, e.g. with mild soap and water. Further, environmental conditions such as ultraviolet radiation, high temperature, humidity, and temperature cycling conditions may not affect the adhesive strength of REGABOND-S sufficiently to make it unsuitable for use in attaching an accessory to a computing device. Thus, such a microstructured adhesive tape may provide for a stronger and reusable adhesive mechanism to attach an accessory device to a computing device than that provided by magnetic attachments alone.
In other examples, other types of micro-suction cup tape may be utilized. Further, other microstructured adhesive tapes than micro-suction tapes also may be used. For example, as mentioned above, a microstructured tape may include a plurality of synthetic setae configured to adhere to a surface via van der Waals forces. It will be understood that any other suitable types of microstructured adhesive tapes may be utilized.
Another example provides a system comprising a computing device and an accessory device mountable to the computing device via a microstructured adhesive tape on one of the computing device and the accessory device, the microstructured adhesive tape configured to adhere to a mating surface on another of the computing device and the accessory device. The mating surface may be additionally or alternatively located on the computing device, and the microstructured adhesive tape may be additionally or alternatively located on the accessory device. The mating surface may be additionally or alternatively formed from a mating surface material having a surface finish of less than or equal to one micron. The mating surface may be additionally or alternatively located on the accessory device, and the microstructured adhesive tape may be additionally or alternatively located on the computing device. The microstructured adhesive tape may additionally or alternatively include micro-suction cups. The microstructured adhesive tape may additionally or alternatively include synthetic setae. The system may additionally or alternatively include a magnet on one of the computing device and the accessory device and a magnetic material on another of the computing device and the accessory device. The computing device may additionally or alternatively include one or more of a laptop computing device, a tablet computing device, and a head-mounted display device. The accessory device may additionally or alternatively include one or more of a keyboard and a stylus.
Another example provides an accessory device comprising a support surface located on the accessory device, the support surface comprising a shape configured to interface with a complementary mating surface on a computing device, and a microstructured adhesive tape disposed on the support surface, the microstructured adhesive tape being configured and to attach to the complementary mating surface on the computing device. The microstructured adhesive tape may additionally or alternatively include micro-suction cups. The microstructured adhesive tape may additionally or alternatively include synthetic setae. The accessory device may additionally or alternatively include a magnetic material. The accessory device may additionally or alternatively include one or more of a keyboard and a stylus. The computing device may additionally or alternatively include one or more of a laptop computing device, a tablet computing device, and a head-mounted display device.
Another example provides a system, comprising a computing device, an accessory device mountable to the computing device via a micro-structured adhesive tape on one of the computing device and the accessory device, the micro-structured adhesive tape configured to adhere to an mating surface on another of the computing device and the accessory device, and one or more magnets located on one or more of the computing device and the accessory device to further secure the accessory device to the computing device. The mating surface may be additionally or alternatively located on the computing device, and the micro-structured adhesive tape may be additionally or alternatively located on the accessory device. The mating surface may be additionally or alternatively located on the accessory device, and the micro-structured adhesive tape may be additionally or alternatively located on the computing device. The computing device may additionally or alternatively include one or more of a laptop computing device, a tablet computing device, and a head-mounted display device. The accessory device may additionally or alternatively include one or more of a keyboard and a stylus.
It will be understood that the configurations and/or approaches described herein are exemplary in nature, and that these specific embodiments or examples are not to be considered in a limiting sense, because numerous variations are possible. The specific routines or methods described herein may represent one or more of any number of processing strategies. As such, various acts illustrated and/or described may be performed in the sequence illustrated and/or described, in other sequences, in parallel, or omitted. Likewise, the order of the above-described processes may be changed.
The subject matter of the present disclosure includes all novel and nonobvious combinations and subcombinations of the various processes, systems and configurations, and other features, functions, acts, and/or properties disclosed herein, as well as any and all equivalents thereof.