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Personal care device with thermal feedback and operating conditions display

a technology of operating conditions and personal care devices, which is applied in the direction of hair cleaning, hair equipment, hair drying, etc., can solve the problems of personal injuries, fire hazards, and increase the temperature of the heating element, so as to reduce the risk of personal injuries

Inactive Publication Date: 2006-05-04
CHAN WING KIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Accordingly, it is an object of the present invention to provide personal care devices such as hair dryers, hair blowers, hair curlers and fan-heaters with safety and protective means are provided to alleviate the risk of personal injuries or fire hazards due to over-temperature resulting from adverse or inappropriate operation conditions of the devices.

Problems solved by technology

However, this is not always the case and the temperature of the heating element can be substantially elevated when the exit air passageway is blocked, for example, when the air-outlet or nozzle is placed too close near the head of the user or other blocking surfaces.
This undesirable obstruction of airflow through the passageway adversely increases the temperature of the heating element because of insufficient ventilation and may result in personal injuries as well as fire hazards.
Furthermore, while such personal care devices are provided with user selectable switches graduated with discrete levels for setting the operating conditions, such controlling knobs are usually in the form of rocker switches which do not provide the user with any useful and indicative operating information.

Method used

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  • Personal care device with thermal feedback and operating conditions display
  • Personal care device with thermal feedback and operating conditions display
  • Personal care device with thermal feedback and operating conditions display

Examples

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Embodiment Construction

[0020] Referring firstly to the hybrid circuit and block diagram of FIG. 1 and the partially exploded drawing of FIG. 7, there is shown an application in which a thermal sensing means is utilized for automatic thermal feedback to control the operation of the heating elements of a hair dryer 10 as an example. The circuit arrangement includes a thermal sensing frontend circuitry 100, a synchronization circuitry 110 for synchronizing with the alternating current supply to which the hair dryer is connected, controlling means 120 which is a micro-controller unit (“MCU”) in the present example, a first heating element 130 and a second heating element 140 which are connected in parallel and individually switchable. It will become apparent from the description below that the output heating power of the hair dryer can be flexibly and sophistically varied by selective turning on the individual heaters during different times of the cycles of the alternating current power supply.

[0021] Broadly...

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Abstract

A personal care device such as a hair dryer with thermal feedback sensor near the air-outlet for automatic heating power reduction when a pre-determined threshold temperature has reached. The device further includes graphical and numerical displays indicating its operating conditions.

Description

FIELD OF INVENTION [0001] The present invention relates to personal care devices and, more particularly, to personal care devices provided with heating elements and a motor driven fan. This invention also relates to hair care devices with a liquid crystal display (LCD) device. More specifically, although of course not solely limiting thereto, this invention relates to hair dryers and fan heaters with over-temperature protection and operating conditions display. BACKGROUND OF THE INVENTION [0002] Personal care devices with heating elements and a motor driven fan are generally used to enhance personal comfort or personal grooming. [0003] For example, a hair care device such as a hair dryer or a hair curler with a heater and a motor driven fan provides a convenient and localized heating source with forced air circulation so that warm air can be delivered for hair care and styling within a short time. In such applications, a wide range of heating power level variation and fan-speeds is ...

Claims

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Application Information

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IPC IPC(8): A45D20/10A45D20/30
CPCA45D20/10A45D20/30
Inventor CHAN, WING KIN
Owner CHAN WING KIN
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