CN2557953Y - Pointer type multimeter with cold light no-reflection indication circuit - Google Patents
Pointer type multimeter with cold light no-reflection indication circuit Download PDFInfo
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- CN2557953Y CN2557953Y CN 02271385 CN02271385U CN2557953Y CN 2557953 Y CN2557953 Y CN 2557953Y CN 02271385 CN02271385 CN 02271385 CN 02271385 U CN02271385 U CN 02271385U CN 2557953 Y CN2557953 Y CN 2557953Y
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- 230000006870 function Effects 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 11
- 239000012634 fragment Substances 0.000 claims description 5
- 206010070834 Sensitisation Diseases 0.000 claims description 3
- 108091008695 photoreceptors Proteins 0.000 claims description 3
- 230000008313 sensitization Effects 0.000 claims description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 2
- 239000003086 colorant Substances 0.000 abstract description 3
- 230000035807 sensation Effects 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model provides a pointer-type multimeter with a cold light film (EL) backlighting display circuit. The utility model is characterized in that the backlighting display circuit includes a power supply, a sensitive switch element, a drive and the drive accessory elements, which form an automatic light sensation and drive circuit for outputting drive signals to an EL film component according to sensitive signals; the EL film includes more than one independent EL film which has the same or less numbers as or than functional gears, the EL films are respectively arranged in a local region where a functional gear of a measuring circuit on a meter panel, and on each EL film, only the part(s) with scale marks and/or digitals and/or signs are lighting parts. The utility model combines the lighting and colors of the EL film with the gear scale accordingly, with clear, visual and lively display and lower power consumption.
Description
Technical field
The utility model relates to pointer multimeter, especially relates to a kind of pointer multimeter that has cold light film (EL) display circuit backlight.
Background technology
Display technique backlight generally is to adopt light emitting diode (LED) or cold light film (EL) backlight, be used for many need be at the electronic product of dim environmental readings or demonstration.Multimeter is a kind of electronic measuring instrument commonly used, generally has multiple function gears such as resistance, electric current, voltage.Display technique backlight also has application in multimeter, but because display mode is limit, only is used for digimer at present, and does not distinguish gear.Existing digimer is that EL display circuit backlight is done as a whole being connected in the metering circuit, when work overall region all shinny and seem and confeuse the parimary with secondary that contrast is not strong, and power consumption is bigger, dull coloring.The digital watch backlight of using led lighting is also arranged, but because diode is that single-point type is luminous, whole regional luminance is inhomogeneous.At present, also be not applied to display technique backlight in the pointer multimeter, be unfavorable for that it uses in environment with dark light.
Summary of the invention
The purpose of this utility model is to solve pointer multimeter in the prior art to be unfavorable for the problem used in environment with dark light, and a kind of EL of having is provided the pointer multimeter of display circuit backlight, in its display circuit, luminous and the color of EL sheet and the corresponding combination of gear scale, clear display, directly perceived, lively, power consumption is lower.
The purpose of this utility model is achieved in that the pointer multimeter of a kind of EL of having display circuit backlight, comprises power supply, EL chip module, dial switch, metering circuit and panel board; The shell fragment of described dial switch has the contact more than, described metering circuit has the function gear more than, and have on the metering circuit corresponding to each function gear and the corresponding contact of dial switch contact jaw, it is characterized in that: also comprise optical switch element and driver, described power supply, optical switch element, driver and attached components and parts thereof are formed automatic sensitization and driving circuit, with according to photoreceptor signal to described EL chip module output drive signal; Described EL chip module comprises more than one but is equal to or less than the mutual discrete EL sheet of function gear number, each EL sheet is separately positioned on the residing regional area of a certain function gear of metering circuit on the panel board, and is the luminous site at the position that scale mark and/or numeral and/or symbol are arranged only on each EL sheet; Described driver has two power take-offs, one of them output terminal is connected with the common port of described each EL sheet, another output terminal connects a contact contact jaw of the difference in functionality gear of metering circuit respectively, and the other end of each EL sheet connects another contact contact jaw of the difference in functionality gear of metering circuit respectively.
When dial switch is beaten in working order, a certain function gear of metering circuit is switched on; Under the darker condition of light, the optical switch element is switched on, and starts driver, to EL sheet output drive signal, because the effect of dial switch is switched on the EL sheet on the corresponding regional area, thereby make on the panel board scale mark and the symbol on a certain function gear shinny.When dial switch is beaten in off working state, even driver is activated, metering circuit and EL sheet can not worked, thus the power consumption of greatly reducing.
Described each EL sheet that is arranged on the different gears is different color.
Implement the pointer multimeter that has EL display circuit backlight of the present utility model, because each the EL sheet in its display circuit backlight is distributed in respectively on the scale mark, numbers and symbols of the different gears of panel board, and control by optical switch element, driver and dial switch, have only in working order down, scale mark on the required gear, numbers and symbols just can be lighted, therefore, clear display backlight, directly perceived, power consumption is lower.Owing to each EL sheet is arranged to different colours according to different gears, in working order,, also can know measured tested parameter even do not see gear, made things convenient for the user in environment with dark light, to use.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the utility model pointer multimeter of having EL display circuit backlight;
Fig. 2 is the schematic block circuit diagram of pointer multimeter shown in Figure 1;
Fig. 3 is the physical circuit connection diagram of pointer multimeter shown in Figure 1.
Embodiment
As shown in Figure 1, in an embodiment of the present utility model, pointer multimeter has EL display circuit backlight, comprises power supply, optical switch element 1, dial switch 2, EL chip module 3, driver, panel board 4 and metering circuit.
As shown in Figures 2 and 3, dial switch is to adopt that to be similar on the digital watch serve as the V-type shell fragment that rotates the center of circle with the dial center, and four contacts of arrangement in alignment are arranged on the shell fragment.When the rotating driver plate switch, then the contact on the shell fragment is connected with four contact contact jaws 5 of the metering circuit of corresponding gear respectively, and the tested parameter of described function gear correspondence can be resistance, electric current, voltage etc.In the present embodiment, the four measuring parameter is arranged, comprise resistance, DC current, DC voltage and alternating voltage, wherein, DC current and DC voltage are used same display scale line, therefore, three sections concentric circles arcuation scale marks are arranged on the panel board, series arrangement from outside to inside, corresponding resistance grade, DC current/shelves of direct voltage and alternating voltage shelves.Because metering circuit is well known to those skilled in the art, and belongs to the scope of prior art, so be not explained in detail in this manual.
Be the luminous site only on each EL sheet, and each EL sheet is set to different colours at the position that scale mark and symbol are arranged.In the present embodiment, the color of the scale mark of corresponding resistance grade, DC current/shelves of direct voltage and alternating voltage shelves and symbol is set to green, blueness and red respectively.
Also comprise optical switch element and driver in the circuit, power supply, optical switch element and driver and attached components and parts thereof are formed automatic sensitization and driving circuit, thereby can be according to photoreceptor signal to described EL chip module output drive signal.
The optical switch element has adopted a light activated element and a switch triode, and light activated element can use photoresistance or phototriode.In the present embodiment, adopt phototriode 601, the collector of phototriode 601 links to each other with the base stage of switch triode 602.It is the chip for driving of WD25B that driver adopts model.Power supply links to each other with the 1st pin (VDD) of chip for driving, to provide power supply to chip for driving; The trigger end of switch triode 602 links to each other with the 5th pin (IEV) of chip for driving, with to the chip for driving output drive signal; Chip for driving the 15th with the base stage that connects generator triode 603 after 16 pins link to each other, the 14th pin of chip for driving connects the base stage of a pliotron 604; The collector of generator triode 603 is divided into two branch roads, a branch road connects electric capacity, form the oscillatory circuit of chip for driving, another branch road connects the collector of two diodes, resistance and pliotron 604, form rectification boosting circuit, the emitter of pliotron 604 connects the contact contact jaw of the difference in functionality gear of metering circuit.
Only when light intensity was not enough, phototriode 601 and switch triode 602 just were in conducting state, thereby chip for driving is triggered; When dial switch was connected the contact contact jaw of metering circuit of corresponding gear, then the metering circuit of this gear and certain EL sheet were connected, and by chip for driving and pliotron 604, the scale mark of corresponding gear and symbol send the light of certain color.When dial switch is beaten in off working state, even driver is activated, the EL sheet can not lighted yet, thus the power consumption of greatly reducing.
Claims (8)
1. a pointer multimeter that has EL display circuit backlight comprises power supply, EL chip module (3), dial switch (2), metering circuit and panel board (4); The shell fragment of described dial switch has the contact more than, described metering circuit has the function gear more than, and have on the metering circuit corresponding to each function gear and the corresponding contact of dial switch contact jaw (5), it is characterized in that: also comprise optical switch element and driver, described power supply, optical switch element, driver and attached components and parts thereof are formed automatic sensitization and driving circuit, with according to photoreceptor signal to described EL chip module output drive signal; Described EL chip module comprises more than one but is equal to or less than the mutual discrete EL sheet of function gear number, each EL sheet is separately positioned on the residing regional area of a certain function gear of metering circuit on the panel board, and is the luminous site at the position that scale mark and/or numeral and/or symbol are arranged only on each EL sheet; Described driver has two power take-offs, one of them output terminal is connected with the common port of described each EL sheet, another output terminal connects a contact contact jaw of the difference in functionality gear of metering circuit respectively, and the other end of each EL sheet connects another contact contact jaw of the difference in functionality gear of metering circuit respectively.
2. pointer multimeter according to claim 1 is characterized in that: described each EL sheet that is arranged on the different gears is different color.
3. pointer multimeter according to claim 1 and 2 is characterized in that: the number of the mutual discrete EL sheet of described EL chip module equals the function gear number of multimeter.
4. pointer multimeter according to claim 1 and 2 is characterized in that: described optical switch element has adopted a light activated element and a switch triode.
5. pointer multimeter according to claim 4 is characterized in that: described light activated element is to adopt phototriode (601), and the collector of described phototriode (601) links to each other with the base stage of described switch triode (602).
6. pointer multimeter according to claim 4 is characterized in that: described light activated element is to adopt photoresistance.
7. pointer multimeter according to claim 1 and 2 is characterized in that: it is the chip for driving of WD25B that described driver adopts model.
8. pointer multimeter according to claim 5 is characterized in that: described driver is that the employing model is the chip for driving of WD25B, and described power supply links to each other with the 1st pin (VDD) of described chip for driving, to provide power supply to chip for driving; The trigger end of switch triode (602) links to each other with the 5th pin (IEV) of chip for driving, with to the chip for driving output drive signal; Chip for driving the 15th with the base stage that connects generator triode (603) after 16 pins link to each other, the 14th pin of chip for driving connects the base stage of a pliotron (604); The collector of generator triode (603) is divided into two branch roads, a branch road connects electric capacity, form the oscillatory circuit of chip for driving, another branch road connects the collector of two diodes, resistance and pliotrons (604), form rectification boosting circuit, the emitter of pliotron (604) connects the contact contact jaw of the difference in functionality gear of metering circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02271385 CN2557953Y (en) | 2002-06-28 | 2002-06-28 | Pointer type multimeter with cold light no-reflection indication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02271385 CN2557953Y (en) | 2002-06-28 | 2002-06-28 | Pointer type multimeter with cold light no-reflection indication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2557953Y true CN2557953Y (en) | 2003-06-25 |
Family
ID=33736257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02271385 Expired - Fee Related CN2557953Y (en) | 2002-06-28 | 2002-06-28 | Pointer type multimeter with cold light no-reflection indication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2557953Y (en) |
-
2002
- 2002-06-28 CN CN 02271385 patent/CN2557953Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HUANG JINTONG; PENG GANG Free format text: CHANGE FOR CO-PATENTEE; FORMER NAME OR ADDRESS: NONE Owner name: WU ZHAOSU Free format text: FORMER NAME OR ADDRESS: PENG GANG |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518040 Guangdong province Shenzhen Cangsong building, Futian District City, Che Kung Temple Tairan Industrial Zone 1701-1709 room Co-patentee after: Huang Jintong Patentee after: Wu Zhaosu Co-patentee after: Peng Gang Address before: 518040 Guangdong province Shenzhen Cangsong building, Futian District City, Che Kung Temple Tairan Industrial Zone 1701-1709 room Patentee before: Peng Gang |
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| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Yang Jiehong Document name: Notification of Termination of Patent Right |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |