CN2044475U

CN2044475U - Fingerprint display

Info

Publication number: CN2044475U
Application number: CN 89212763
Authority: CN
Inventors: 吴变; 詹德众
Original assignee: Sichuan Provincial Public Security Bureau; Institute of Optics and Electronics of CAS
Current assignee: Sichuan Provincial Public Security Bureau; Institute of Optics and Electronics of CAS
Priority date: 1989-02-02
Filing date: 1989-02-02
Publication date: 1989-09-20

Abstract

The utility model discloses a fingerprint display. The utility model is characterized in that an aggregate solid medicament which is non-volatile and easy vaporisation is adopted by visualization medicament; a discoid heating wire whose resistance is 2.2 omegas is fixed in a metal heating container, which is adopted by a heating device; a multifunction heating controller is arranged on the heating device which can control the heating temperature of the visualization medicament. The utility model has the advantages of simple structure, convenient operation, rapid display, distinct display, and strong cubic effect. The utility model is an advanced fingerprint extracting apparatus used by Chinese police and security departments to investigate at criminal sites in criminal investigations.

Description

Fingerprint display

This utility model is a kind of fingerprint manifestation device, is mainly used in public security career department and manifests, extract fresh or outmoded fingerprint in criminal investigation.It comprises following step: in the mask of a sealing by heater to manifesting medicament heating, make it vaporization and attached on the fingerprint, thereby can manifest, extract required fingerprint.

The fingerprint display of present domestic life-time service, heater adopts the structure that is fixed with a metal cylinder in the METAL HEATING PROCESS ware, and the ferrochrome of can powering inserts heating, uses 220 volts of alternating current power supplys, manifesting medicament is 502 glue, and the weak point that this fingerprint manifestation device exists is:

1. because can only be with 220 volts of alternating current power supplys, so areas without electricity and part-time are not powered the regional case that is taken place when tracking down, instrument can't be carried out the work rapidly at the scene, and the scope of application is restricted.

2. the unreasonable structure of heater heats it with electric soldering iron, and the temperature that is fit to medicament vaporization is uncontrollable, electricity network ferrum during use, temperature is up to 400～500 ℃, and medicament is easy to coking in cooking-vessel, the consumption of medicament is big, shows that simultaneously the time of fingerprint was about 15 minutes to 1 hour.

3.502 glue is volatile liquid, be difficult to carry and store, as manifesting the medicament inconvenience, and the fingerprint that manifests unintelligible, adhere to insecure, no third dimension, demonstration of poor quality is not easy to criminal taking pictures, and is unfavorable for as the material evidence long preservation.

The purpose of this utility model is to avoid above-mentioned deficiency of the prior art and provides a kind of applied widely, can control the temperature of heater, manifests fingerprint fast, fingerprint manifestation device easy to use.

The purpose of this utility model can reach by following measure: manifest medicament and select polymer solid chemicals non-volatile, that be easy to vaporize for use, α alpha-cyanoacrylate polymer solid chemicals preferably, the plate-like heating wire that heater adopts and fix a resistance in the METAL HEATING PROCESS ware is 2.2 Ω, and be connected to a multi-functional heating controller.

The purpose of this utility model can also reach by following measure: multi-functional heating controller comprises a control device that can conveniently use two kinds of power supplys of AC and DC.Also comprise a timing means of controlling heat time heating time.Comprise that an energy is to ickel-cadmium cell and common batteries charging and the charging checkout gear when charging.

Description of drawings:

Fig. 1, this utility model heater structure chart;

Fig. 2, the multi-functional heating controller circuit structure diagram of this utility model;

This utility model is described in further detail below in conjunction with (accompanying drawing) embodiment:

As Fig. 1, be used for holding the METAL HEATING PROCESS ware (1) that α alpha-cyanoacrylate solid manifests medicament (3), be placed with a mica sheet (2) and the plate-like heating wire (4) that resistance is 2.2 Ω, and be fixed on by a screw (5), nut (6) and bakelite packing ring (7) on the shell (8) of insulation heatproof.With the power capacity and the radiating condition of 2.2 Ω heating wire, after binding post (9) energized, can make the temperature of heating be controlled at α alpha-cyanoacrylate solid and manifest in the required temperature range of medicament vaporization 180 ℃～200 ℃.

As Fig. 2, multi-functional heating controller comprises the control device that can provide and use two kinds of power supplys, and in the time will using 220 volts of power supplys of interchange, gauge tap can be connected (5), (6), (7) contact.At this moment, 220 volts of power supplys become low-voltage about 6 volts through transformator, offer timing means (10) and heater (11), if use dc source, gauge tap can be connected (3), (8), (9) contact, and then four joint GNY4 type ickel-cadmium cells or a common battery just can be to timing means (10) and heater (11) power supplies.The timing means of multifunctional controller (10) adopts big electric capacity charging, by discharge resistance and Darlington transistor discharge, make the relay adhesive, thereby heater (11) begins heating, when temperature is raised to 180 ℃～200 ℃ of required vapourizing temperatures of α alpha-cyanoacrylate medicament, the beginning fingerprint manifest process.When big capacitor discharge finishes, relay is decontroled, the power supply of heater (11) cuts off automatically, stopped heating, timing is 4 minutes, and the vaporization body that manifests medicament (3) is full of the plastic seal mask, and begins to cool down sedimentation, on the fingerprint that will extract, fingerprint just very clearly shows.For guaranteeing the use of dc source, multi-functional heating controller can be used as charger to battery charge, at every turn can be to four joint GNY4 type ickel-cadmium cells or common No. 1 battery charge of four joints, charging current 400mA.Adopt the constant-current source circuit structure, be that transistor constant current source (12) and constant current voltage stabilizing circuit (13) are used as the checkout gear that charges, reach tapered charge automatically behind the required value with convenient battery charge, can stop charging when reaching ceiling voltage automatically, prevent battery overcharge.

The utility model is compared prior art and is had following advantage:

1. adopt two kinds of power supplys of AC and DC and can enlarge the scope of application of instrument electricity being arranged or not having in the electric situation and reconnoitre the scene to the structure of ickel-cadmium cell and common batteries charging, scene evidence taking has been created fabulous condition with solving a case.

2. heater is simple and reasonable, and its heat time heating time can be regularly, and its temperature control is in manifesting the required temperature range of medicament vaporization, and medicament both can be vaporized fully, again can be because of excess Temperature generation coking. The fingerprint manifestation time is very short about 50 seconds to 1 minute, has not only greatly improved operating efficiency and the quality of instrument, the use amount that can also save medicament, not only fast but also economical.

3. adopt the polymer solid to manifest medicament, good developing effect, the fingerprint clear that shows has third dimension, in conjunction with firmly, is convenient to criminal taking pictures, but as the material evidence long preservation of extracting.

Claims

1, a kind of in the mask of sealing by heater to manifesting medicament heating, make it the vaporization and attached on the fingerprint, thereby can show the fingerprint manifestation device of required fingerprint, it is characterized in that manifesting medicament and select polymer solid chemicals non-volatile, that be easy to vaporize for use, α alpha-cyanoacrylate solid chemicals preferably, the plate-like heating wire that to be fixed with a resistance in the METAL HEATING PROCESS ware of heater be 2.2 Ω also is connected to a multi-functional heating controller.

2, fingerprint manifestation device as claimed in claim 1 is characterized in that multi-functional heating controller, comprises a control device that can use two kinds of power supplys of AC and DC easily.

3,, it is characterized in that multi-functional heating controller also comprises a timing means of controlling heat time heating time as claim 1,2 described fingerprint manifestation devices.

4,, it is characterized in that the checkout gear when multi-functional heating controller also comprises an energy to ickel-cadmium cell and common batteries charging and charging as claim 1,2 described fingerprint manifestation devices.