CN2651732Y

CN2651732Y - Electronic thermometer with negative light apparatus

Info

Publication number: CN2651732Y
Application number: CN 200320103217
Authority: CN
Inventors: 陈三莲
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-11
Filing date: 2003-11-11
Publication date: 2004-10-27
Anticipated expiration: 2013-11-11

Abstract

The utility model relates to an electronic thermometer with a back light device, which comprises a display unit and a flake, wherein the display unit has the light permeability, the flake can store and release the light energy, the flake is positioned at the back of the display unit, the flake uses the lighting of fluorescent powder as the back light to realize the purpose of display. After the utility model obtains the photon energy of the outside light source from the light transmission of the liquid crystal clearance of the liquid crystal layers of a liquid crystal display and the light transmission of a casing clearance of the thermometer, the atoms of fluorescent powder is activated to carry out the energy storage. After the outside light source is turned off, the fluorescent powder can carry out luminescence. The liquid crystal display obtains the back light to realize the display without any electronic element, so that the structure of the thermometer is simplified.

Description

A kind of electronic thermometer that contains back lighting device

Technical field

The utility model relates to a kind of medical or home-use clinical thermometer, refers in particular to a kind of electronic thermometer that contains back lighting device.

Background technology

In the electronic thermometer of prior art, the behind of LCD (LCD) is typically provided with polaroid, and the content of liquid crystal display only just can be seen under illumination.In order to satisfy the requirement of using in the dark, use back lighting device.The glassy layer that sees through LCD backlight, liquid crystal layer, the user can see content displayed in the dark.

In prior art, it is to adopt electroluminescence (EL) that the back lighting device of LCD has a kind of, and electric energy directly is converted to luminous energy.Luminescent material is under effect of electric field, and electronics runs up in luminescent layer, activates the luminescent material atom, it is accelerated and obtains enough energy, and bump and brush lightly luminescent center, luminescent center is excited or ionization, activate luminescent center get back to ground state or compound and discharge, luminous.Electroluminescence requires to exchange, high pressure, when powered battery, needs a transducer that direct current is converted to interchange.

Another kind of backlight technology is luminous with light emitting diode (LED), by the light guide sheet leaded light, point-like light is become uniform fill light, as backlight again.

These technology all are to rely on electric energy to be changed into luminous energy and to obtain backlightly, need to adopt electronic component, and cost of manufacture is higher, complex process.In these technical schemes, liquid crystal board is had no idea always luminous, needs to set fluorescent lifetime, and the magnetic field effect that electric current produces may produce the interference to measurement signal.

The utility model content

With LCD (LCD), a kind of non-electricly, luminous automatically backlightly seem very meaningful for electronic thermometer, thus the purpose of this utility model provide a kind of not electricity consumption but can luminous automatically electronic thermometer.

For achieving the above object, embodiment of the present utility model is: a kind of electronic thermometer that contains back lighting device, comprise that a display unit and with light transmission can store and discharge the thin slice of luminous energy, and this thin slice is put what display unit rear.

Described display unit is a LCD, it comprises outer glassy layer, liquid crystal layer, thin-film capacitor, end glassy layer, under the effect of voltage, the liquid crystal of liquid crystal layer is orderly arrangement, produce the liquid crystal gap, extraneous photons of light arrives thin slice by liquid crystal gap, thin-film capacitor, the end glassy layer of outer glassy layer, liquid crystal layer.

Described thin slice is made up of base material and phosphor powder layer, and described base material is the broad sheet of a thin paper or a hard, and fluorescent powder is coated with and sticks on thin paper or the thin slice.

Described thin paper or thin slice are fixed between circuit board and the end glassy layer, and phosphor powder layer is facing to end glassy layer.

Described thin slice is to be made of plastic cement doping fluorescent powder.

The position hollow out of corresponding thin slice on the described circuit board, thin slice is fixed between end glassy layer and the core frame.

Commonly use backlight technology, the power supply of not using backlight of the present utility model can not produce galvanomagnetic effect, does not use electronic component backlight, has energy-conservation effect, has reduced cost, has simplified production technology.

Description of drawings

Fig. 1 is the three-dimensional exploded view of embodiment one;

Fig. 2 is the structural drawing of embodiment one;

Fig. 3 is the structural drawing of embodiment two;

Fig. 4 is extraneous light synoptic diagram for back lighting device receives;

Fig. 5 is the synoptic diagram of the luminous irradiating liquid crystal display of back lighting device.

Embodiment

As shown in Figure 1, a kind of electronic thermometer that contains back lighting device, include a casing 1, a bonnet 3, a core frame 2, a LCD 5, a bus 7 and a drain pan 4, it also includes a thin slice 6 that scribbles the fluorescent powder that can store and discharge luminous energy, when the atom of extraneous photons of light and fluorescent powder collides, its part energy is used to increase the energy of this fluorescent powder atom, other portion of energy are used for the extremely higher energy rank of electronics in the excited atom, when the lower stabilization energy rank of these electronics rebounds, emit the visible light of more ultraviolet low frequency.

As Fig. 2, shown in Figure 4, in embodiment one, LCD (LCD) comprises outer glassy layer 51, liquid crystal layer 52, thin-film capacitor 53, end glassy layer 54, under the effect of voltage, the liquid crystal of liquid crystal layer is orderly arrangement, produce liquid crystal gap 8, extraneous light 9 arrives back lighting device 10 by liquid crystal gap, thin-film capacitor, the end glassy layer of outer glassy layer, liquid crystal layer.

As shown in Figure 2, described electronic thermometer is made of base material 55 and fluorescent powder 56 with LCD (LCD) back lighting device.When making back lighting device, the fluorescent powder 56 of high concentration directly is coated on the base material 55, base material can be paper or sheet, and the area size of back lighting device is identical with liquid crystal board.During installation back lighting device is fixed between circuit board and the end glassy layer 54, makes circuit with bus 7 between liquid crystal board and the circuit board and connect.Back lighting device has the end glassy layer 54 of a side of fluorescent powder 56 facing to liquid crystal board, to guarantee that fluorescent powder can receive the photon energy that external light source sends.Present embodiment is applicable to that backlight requires very thin situation.

As shown in Figure 3, in embodiment two, back lighting device is made of the fluorescent powder 12 of doped with high concentration in the transparent plastic cement 11.The area size of back lighting device is identical with end glassy layer 54.In the present embodiment, the position hollow out of corresponding back lighting device on the circuit board, back lighting device is fixed between end glassy layer 54 and the core frame 2, does circuit connection with bus 7 between its size and identical LCD of end glassy layer 54 areas and the circuit board.As shown in Figure 4, impinge upon on the back lighting device 10 when extraneous light sees through liquid crystal gap 8, the fluorescent powder in the back lighting device receives photon energy, can put aside energy.Present embodiment is applicable to the situation that backlight is thicker.

Use the electric body-temperature timing in night, extraneous light 9 arrives back lighting device 10 by liquid crystal gap 8, thin-film capacitor 53, the end glassy layer 54 of outer glassy layer 51, liquid crystal layer 52, and the fluorescent powder atom receives the energy that photon transmits.After light is turned off, as Fig. 5, the energy savings of fluorescent powder atom makes electronics continue active beating, and keep and emit visible fluorescence from end glassy layer 54 back illumination, after light sees through end glassy layer 54, thin-film capacitor 53, liquid crystal gap 8, even in the environment of dark, also can accurately read content displayed.Generally after indoor light shone 1～2 second, fluorescent powder can be kept luminous about 10 minutes.When temperature taking, heat conduction required time was at 10～15 minutes, even so just turn off external lights immediately just clinical thermometer being placed on measurement sites, still can be luminous in the test duration to the back back lighting device, can satisfy the requirement of reading metric data after the light-off.

The back lighting device of electronic thermometer of the present utility model need not any circuit and connects, and need not special electronic component, has reached purpose of energy saving, has simplified production technology.As long as through illumination, can be luminous automatically as requested.

Claims

1, a kind of electronic thermometer that contains back lighting device comprises that a display unit and with light transmission can store and discharge the thin slice of luminous energy, and this thin slice is put what display unit rear.

2, the electronic thermometer that contains back lighting device as claimed in claim 1 is characterized in that: described display unit is a LCD, and it comprises outer glassy layer, liquid crystal layer, thin-film capacitor, end glassy layer.

3, the electronic thermometer that contains back lighting device as claimed in claim 1 or 2, it is characterized in that: described thin slice is made up of base material and phosphor powder layer, and described base material is a thin paper or a hard sheet, and fluorescent powder is coated with and sticks on thin paper or the thin slice.

4, the electronic thermometer that contains back lighting device as claimed in claim 3 is characterized in that: described thin paper or thin slice are fixed between circuit board and the end glassy layer, and phosphor powder layer is facing to end glassy layer.

5, the electronic thermometer that contains back lighting device as claimed in claim 1 or 2 is characterized in that: described thin slice is to be made of plastic cement doping fluorescent powder.

6, the electronic thermometer that contains back lighting device as claimed in claim 5 is characterized in that: the position hollow out of corresponding thin slice on the circuit board, thin slice is fixed between end glassy layer and the core frame.