This application claims priority from Taiwan Patent Application No. 105125559 filed on Aug. 11, 2016, which are hereby incorporated herein by reference in its entirety.
The invention relates to a contact lens capable of receiving electrical energy from its exterior, and particularly, to a method of power transmission to a contact lens and a system using the same.
A contact lens is a lens placed on the cornea of an eye for vision correction or eye protection. When the miniature technology of electrical devices has been gradually mature, a contact lens is used not only to correct vision but also to sense the physical properties of an eye or mechanical substances in tears by a miniaturized electrical device which is embedded into the contact lens. Thus, a user can understand the health of his eyes or body. For example, a control circuit, a microprocessor, a communication device, a power supply, a sensor, an actuator, an LED, a photoelectrical sensor, or a miniaturized antenna is integrated with a contact lens so that the contact lens can be used to correct vision and further improve vision. Furthermore, it can yield additionally functional results.
The foregoing miniaturized electrical device needs to consume electrical power for its normal operation. Accordingly, it is an important and unresolved problem that sufficient electrical power is effectively supplied to the contact lens. For example, U.S. publication patent application US2013/0041245 A1 disclosed an assembly of a contact lens and a pressure sensor capable of long-termly measuring intraocular pressure. The assembly embeds a resistance pressure sensor, an antenna, and a sensing chip into the contact lens. Such assembly of the contact lens is worn on the cornea of an eye. The electrical power is transmitted to the assembly of the contact lens by near field coupling. Accordingly, an antenna capable of transmitting data and electrical power is attached to the surrounding (i.e. an eye socket) of an eye for a tester. Moreover, the antenna is in electrical communication with a portable record apparatus by an electrical wire, and is capable of being powered by the portable record apparatus to generate an electromagnetic field with sufficient sensitivity. Thus, a required coupling current is induced in the antenna of the contact lens. However, when the apparatus and the antenna mounted to the eye socket simultaneously operate, the surrounding of the eye of the tester exists in the electromagnetic field with a certain power density so that a chronic injury is caused to the delicate eye. Furthermore, the electrical wire wraps tester's body so that he moves with some difficulty.
Also, U.S. Pat. No. 8,096,654 B2 disclosed a contact lens whose interior has an image display, several processing chips, an energy transfer antenna, and biosensors. In addition to the contact lens, a radio frequency communication apparatus and a power supply apparatus are necessarily provided at a far side. Such a contact lens can be applied to image display, biomedical sensing or related uses. It consumes the power externally from the power supply apparatus which electrically powers the contact lens in a far-field transferring energy way. Likewise, a tester needs to wear an additional apparatus, and exists a high power electromagnetic environment so that his eye and body may have quite injuries.
In view of above, the users are in very need of a safe and compact energy transfer apparatus capable of energy harvest (harvesting energy from the external of the system or apparatus and transferring it to electrical energy) and a contact lens with circuits which simultaneously operate. It can be broadly applied to preventive medicine and correctional health.
The present application provides a method of power transmission to a contact lens and a system using the same. Electrical energy is generated to power electrical components within a contact lens by physical motion based on the electromagnetic induction theory.
In view of above aspects, the present invention provides a system of power transmission to a contact lens which comprises a contact lens comprising at least a physiological signal sensing component, an induction coil, and an energy storage component electrically connected to the physiological signal sensing component and the induction coil; and a magnetic component, wherein an induction electromotive force is produced in the induction coil for charging the energy storage component when the magnetic component has a motion relative to the induction coil.
In an embodiment, the magnetic component comprises a material capable of generating magnetic lines. The magnetic component is disposed on the surface of an upper lid.
In an embodiment, the contact lens comprises a transparent material. The physiological signal sensing component, the induction coil, and the energy storage component are embedded into the transparent material.
In an embodiment, the induction coil is an antenna for transmitting wireless signals. The system comprises a receiving analyzer for receiving and analyzing the wireless signals from the antenna.
In an embodiment, the physiological signal sensing component is used to measure the intraocular pressure, humidity, temperature, pH, or the composition of tears for an eye. The contact lens further comprises a power management circuit. The power management circuit conducts rectification, voltage limitation, and voltage stabilization (regulation) for the induction electromotive force, and stores processed electrical energy in the energy storage component.
In an embodiment, the contact lens further comprises a transceiver and processer circuit including: a signal reading circuit capturing electrical signals generated from the physiological signal sensing component; a processor converting the electrical signals into processed signals; a modulator adapting the impedance of the induction coil to control the induction coil for generating the induction electromotive force, receiving high frequency wireless signals from an exterior or transmitting wireless signals to the exterior or being capable of converting the processed signals into high frequency wireless signals for feeding the induction coil them to transmit outwardly; and a demodulator receiving the high frequency wireless signals received by the induction coil from the exterior and recovering the high frequency wireless signals to low frequency signals for transmitting them to the processor.
In an embodiment, the energy storage component is a capacitor, an inductor, or a battery.
The present invention further provides a method for transmitting electrical energy to a contact lens comprising the steps of: providing a contact lens with an induction coil and a magnetic component; and moving the magnetic component relative to the induction coil in a manner that an induction electromotive force is produced in the induction coil.
The present invention provides a system of power transmission to a contact lens which comprises a contact lens comprising at least a physiological signal sensing component and an induction coil; and a magnetic component, wherein an induction electromotive force is produced in the induction coil for powering the physiological signal sensing component when the magnetic component has a motion relative to the induction coil.
In order to sufficiently understand the essence, advantages and the preferred embodiments of the present invention, the following detailed description will be more clearly understood by referring to the accompanying drawings.
The following description shows the preferred embodiments of the present invention. The present invention is described below by referring to the embodiments and the figures. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the principles disclosed herein. Furthermore, that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims.
The physiological signal sensing component 12 may an ASIC (Application-Specific IC), a MEMS device, or a sensing device formed by a nano or peco chemical material, metal material or bio material. They can be used to measure the intraocular pressure, humidity, temperature, pH, or the composition (e.g. blood glucose) of tears. Various sensors with different uses or types may be applied to the embodiment, and include active devices and passive devices. The former ones including active circuits consume more power, and the later ones consume quite less power. The sufficient power is provided to the devices based on their requirements, and otherwise, the devices cannot read sensing signals or normally perform. The transceiver and processer circuit 14 can convert the electrical signals (e.g. voltage signals or current signals) generated from the physiological signal sensing component 12 to radio frequency (RF) signals, and wireless signals are transmitted outwards by the antenna 13. The application is not limited to the conversion from the electrical signals to the RF signals. The electrical signals may be converted to signals Bluetooth conforming to Bluetooth or WiFi protocols. Similar to the foregoing ring-like wirings, the antenna 13 is coated on the surface of the transparent substrate 11 and disposed outside the temperature sensing device as several ring-like wirings. It transmits wireless signals conforming to a communication protocol outwards.
The foregoing magnetic component comprises a material capable of generating magnetic lines. Therefore, the induction coil 13 cuts the magnetic lines, and an induction electromotive force is produced in the induction coil 13. The induction coil 13 is made in an electrically close loop so that an induced voltage is accordingly produced by the induction electromotive force.
A demodulator 753 receives the wireless signals collected by the induction coil 71 from the exterior of the contact lens, and recovers the high frequency wireless signals to low frequency signals. The wireless signals may be the control signals or other signals emitted from the mobile phone 61 or the notebook computer 62 (
The foregoing embodiments of the invention have been presented for the purpose of illustration. Although the invention has been described by certain preceding examples, it is not to be construed as being limited by them. They are not intended to be exhaustive, or to limit the scope of the invention. Modifications, improvements and variations within the scope of the invention are possible in light of this disclosure.
Number | Date | Country | Kind |
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105125559 | Aug 2016 | TW | national |