CN219082841U

CN219082841U - Trace finding tool

Info

Publication number: CN219082841U
Application number: CN202320138982.5U
Authority: CN
Inventors: 朱双全
Original assignee: Criminal Police Detachment Of Huainan Public Security Bureau
Current assignee: Criminal Police Detachment Of Huainan Public Security Bureau
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-05-26
Anticipated expiration: 2033-02-07

Abstract

The utility model discloses a trace finding tool which comprises a cylindrical light source and a handle, wherein an annular panel is arranged at the top end of the cylindrical light source, a light source circuit board is arranged on the lower surface of the annular panel, an ultraviolet LED and an annular light source are welded on the inner ring of the light source circuit board, and a white light LED is welded on the outer ring of the light source circuit board. The outside of the cylindrical light source is provided with an outer cylinder, the top end of the outer cylinder is sleeved on the edge of the panel and fixedly connected with the panel through a fastener. The inner cylinder is nested in the outer cylinder, and the top end of the inner cylinder is fixedly connected with the lower surface of the annular panel. A light-gathering bracket is arranged on the outer wall of the inner cylinder in a surrounding way, and a light-gathering body is fixedly arranged on the light-gathering bracket and positioned below the white light LED so as to gather light emitted by the white light LED downwards; the bottom end of the outer cylinder is provided with an annular reflecting mirror which is hollow, and the inner side of the annular reflecting mirror is provided with an annular mirror surface with an inclination angle of 45 degrees, so that a light beam passing through the annular mirror surface is reflected by 90 degrees and forms annular grazing incidence in a region to be measured. The utility model has the advantages of small volume, convenient operation, grazing incidence, ultraviolet light, uniform illumination and other functions.

Description

Trace finding tool

Technical Field

The utility model relates to the technical field of forensic science, in particular to a trace finding tool.

Background

The grazing incidence illumination method is preferable for detecting the trace such as the common dust fingerprint on site in the court science field, but the grazing incidence illumination method needs to be operated in a dark environment, the bright environment cannot show the effect, and the equipment with the grazing incidence illumination is usually large in size, heavy in weight and inconvenient to carry and apply in site investigation. Thus, there is a need for a device that is small, lightweight, and portable to accomplish the above.

Disclosure of Invention

Aiming at the technical problems in the background technology, the utility model provides a trace finding tool which is small in size and portable.

In order to achieve the above purpose, the utility model provides a trace finding tool, which comprises a cylindrical light source and a handle, wherein the top end of the handle is fixed with the outer side of the cylindrical light source through a screw and is communicated with a circuit of the cylindrical light source to provide power for the cylindrical light source; the top end of the cylindrical light source is provided with a hollow annular panel, the lower surface of the annular panel is provided with a light source circuit board, an ultraviolet LED and an annular light source are welded on the inner ring of the light source circuit board, and a white light LED is welded on the outer ring of the light source circuit board; an outer cylinder is arranged on the outer side of the cylindrical light source, and the top end of the outer cylinder is sleeved on the edge of the annular panel and fixedly connected with the annular panel through a fastener; the inner barrel is nested in the outer barrel, the top end of the inner barrel is fixedly connected with the lower surface of the annular panel, so that the ultraviolet LED and the annular light source are isolated inside the inner barrel, and the white light LED is isolated between the inner barrel and the outer barrel; a light condensing bracket is arranged on the outer wall of the inner cylinder in a surrounding manner, a light condensing body is fixedly arranged on the light condensing bracket, and the light condensing body is positioned below the white light LED so as to condense light emitted by the white light LED downwards; the bottom end of the outer cylinder is provided with an annular reflecting mirror which is hollow, and the inner side of the annular reflecting mirror is provided with an annular mirror surface with an inclination angle of 45 degrees, so that a light beam passing through the annular mirror surface is reflected by 90 degrees and forms annular grazing incidence in a region to be measured.

Further, the light collector adopts a reflective cup or a convex lens.

Further, the top end of the handle is a U-shaped clamping groove, the bottom end of the handle is a handheld holding rod, and fastening screws used for being fixedly connected with the outer cylinder are arranged on two sides of the top end of the U-shaped clamping groove; the middle part of the inner side of the U-shaped clamping groove is provided with a locating pin, and the locating pin is inserted into a locating hole of the outer cylinder.

Further, an LED driving circuit is arranged in the inner space of the handheld holding rod, and elastic electrode contacts electrically connected with the LED driving circuit are arranged on two sides of the positioning pin and are used for being electrically connected with electrode columns arranged on two sides of the positioning hole of the outer cylinder.

Further, a toggle switch is arranged on the outer side of the handheld holding rod and is electrically connected with the LED driving circuit so as to control the wave band of the LED light source.

Compared with the prior art, the utility model has the advantages that: the trace finding tool designed by the utility model has the advantages of small volume, convenient operation, grazing incidence, ultraviolet light, uniform illumination and other functions.

Drawings

FIG. 1 is a schematic view showing the overall structure of the trace finding tool of the present utility model.

FIG. 2 is an exploded view of an angle of the trace-finding tool of the present utility model.

FIG. 3 is an exploded view of another angle of the trace-finding tool of the present utility model.

Fig. 4 is a cross-sectional view of the trace-finding tool of the present utility model.

Fig. 5 is a top view of the trace-finding tool of the present utility model.

Wherein, 1-light source, 3-handle,

1-1-annular panel, 1-2-light source circuit board, 1-3-ultraviolet LED, 1-4-white LED, 1-5-annular light source,

2-1-outer cylinder, 2-2-light-gathering body, 2-3-light-gathering bracket, 2-4-inner cylinder, 2-5-annular reflector, 2-6-electrode column, 2-7-annular mirror surface,

3-1-toggle switch, 3-2-inner space, 3-3-locating pin, 3-4-elastic electrode contact, 3-5-fastening screw.

Detailed Description

In the following, in order to facilitate the understanding of the technical solutions of the present utility model by a person skilled in the art, reference will be made to the accompanying drawings for further description. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the utility model. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Referring to FIG. 1, a schematic diagram of the whole structure of the trace finding tool of the present utility model is shown, the tool mainly comprises a cylindrical light source 1 and a grip 3, wherein the diameter of the cylindrical light source 1 is 106mm, the height is 110mm, and the tool is small in volume and convenient to carry. The two parts of the cylindrical light source 1 and the handle 3 are combined and fixed by the fastening screw 3-5 and the locating pin 3-3. The power supply of the light source is electrically connected with the electrode columns 2-6 at the two sides of the positioning hole of the outer cylinder 2-1 through the elastic electrode contacts 3-4 of the grip 3.

Referring to fig. 2-5, an outer cylinder 2-1 of a cylindrical light source 1 is sleeved on the edge of a hollow annular panel 1-1 and is fixed by screws, the outer cylinder 2-1 can provide a dark environment required by the whole equipment, a light source circuit board 1-2 is arranged at the lower side of the annular panel 1-1, an ultraviolet LED1-3 and an annular light source 1-5 are welded on the inner ring of the light source circuit board 1-2, a white light LED1-4 is welded on the outer ring, the inner cylinder 2-4 is fixed at the lower side of the annular panel 1-1 by a plurality of screws, meanwhile, the light source circuit board 1-2 is fixed, the inner cylinder 2-4 isolates the ultraviolet LED1-3 and the annular light source 1-5 inside, a containing space of the white light LED1-4 is arranged between the inner cylinder 2-4 and the outer cylinder 2-1, a light condensing body 2-2 is arranged at the lower side of the white light LED1-4, the light condensing body 2-2 is fixed on a light condensing bracket 2-3, the light condensing bracket 2-3 is tightly sleeved on the inner cylinder 2-4, as shown in fig. 3, the white light condensing body 2-4 adopts a reflecting cup, and the white light LED1-4 is downward condensed by the reflecting cup. The annular reflector 2-5 is fixed at the bottom of the outer barrel 2-1, the annular reflector 2-5 is hollow, the inner side of the annular reflector is an annular mirror surface 2-7 with the angle of 45 degrees, and light beams irradiated by LEDs above the annular reflector 2-7 are reflected by 90 degrees, so that annular grazing incidence is formed in a region to be tested at the bottom, and the annular reflector 2-7 provides a good grazing incidence shooting effect for equipment.

As shown in fig. 3-4, the top end of the grip 3 is a U-shaped clamping groove, the bottom end of the grip is a hand-held holding rod, and fastening screws 3-5 used for fixedly connecting with the outer cylinder 2-1 are arranged on two sides of the top end of the U-shaped clamping groove; the middle part of the inner side of the U-shaped clamping groove is provided with a locating pin 3-3, and the locating pin 3-3 is inserted into a locating hole of the outer barrel 2-1. The rear end of the hand-held holding rod is connected with a power line of a battery, the front end of the hand-held holding rod is elastically connected with an electrode column 2-6 in the outer cylinder through an elastic electrode contact 3-6 to supply power, an LED driving circuit is arranged in an inner space 3-2 of the hand-held holding rod, and the wave band of LED light is controlled through a toggle switch 3-1.

The implementation principle of the embodiment is as follows: after the handle 3 is fixed with the cylindrical light source, the power supply circuit is connected, at the moment, an LED light source wave band is selected through the toggle switch 3-1, when annular grazing incidence illumination is selected, the white light LED1-4 is lightened, the white light LED is condensed into parallel light beams through the reflecting cup to irradiate the annular reflector 2-7 at the lower part, and the white light LED deflects 90 degrees to change into annular grazing incidence horizontal irradiation bottom center trace parts. The toggle switch 3-1 is adjusted to the ultraviolet gear, at the moment, the ultraviolet LEDs 1-3 of the annular array are lightened, and the trace is downwards irradiated in the inner cylinder space to excite fluorescence. When the switch 3-1 is shifted to the uniform illumination position, the annular light source 1-5 below the panel is lightened, the annular light uniformly irradiates the bottom trace on the inner barrel part, and the uniform reflected light can be utilized to illuminate the search trace.

In another embodiment, as shown in fig. 2, the light-gathering body 2-2 may be replaced by a convex lens, the light emitted by the white light LED1-4 forming a ring shape is changed into a collimated light beam through the convex lens of the surrounding light-gathering body, and the collimated light beam is reflected by 90 ° downward through the ring-shaped reflector 2-7, and becomes a ring-shaped grazing incidence light beam close to the bottom surface to irradiate the bottom trace, so that a brightness difference is formed between the height of the dust trace. The convex lens of the condenser is fixed in the convex lens hole of the 2-3-condensing bracket, and the 2-3-condensing bracket is tightly sleeved outside the wall of the inner cylinder 2-4 and the condensing distance is adjusted well for fixation.

The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.

Claims

1. The trace finding tool is characterized by comprising a cylindrical light source (1) and a handle (3), wherein the top end of the handle (3) is fixed with the outer side of the cylindrical light source (1) through a screw and is in circuit conduction with the cylindrical light source (1) to provide a power supply for the cylindrical light source; the LED lamp is characterized in that a hollow annular panel (1-1) is arranged at the top end of the cylindrical light source (1), a light source circuit board (1-2) is arranged on the lower surface of the annular panel (1-1), an ultraviolet LED (1-3) and an annular light source (1-5) are welded on the inner ring of the light source circuit board (1-2), and a white LED (1-4) is welded on the outer ring of the light source circuit board; an outer cylinder (2-1) is arranged on the outer side of the cylindrical light source (1), and the top end of the outer cylinder (2-1) is sleeved on the edge of the annular panel (1-1) and fixedly connected with the annular panel by a fastener; the ultraviolet LED lamp is characterized in that an inner barrel (2-4) is nested in the outer barrel (2-1), the top end of the inner barrel (2-4) is fixedly connected with the lower surface of the annular panel (1-1) so as to isolate the ultraviolet LED (1-3) and the annular light source (1-5) inside the inner barrel (2-4), and the white LED (1-4) is isolated between the inner barrel (2-4) and the outer barrel (2-1); a light-gathering bracket (2-3) is arranged on the outer wall of the inner barrel (2-4) in a surrounding manner, a light-gathering body (2-2) is fixedly arranged on the light-gathering bracket (2-3), and the light-gathering body (2-2) is positioned below the white light LED (1-4) so as to enable light emitted by the white light LED (1-4) to gather downwards; the bottom end of the outer cylinder (2-1) is provided with an annular reflecting mirror (2-5), the annular reflecting mirror (2-5) is hollow, and the inner side of the annular reflecting mirror is provided with an annular mirror surface (2-7) with an inclination angle of 45 degrees, so that a light beam passing through the annular mirror surface (2-7) is reflected by 90 degrees and forms annular grazing incidence in a region to be measured.

2. The trace-finding tool as claimed in claim 1, wherein the light-gathering body (2-2) employs a reflective cup or a convex lens.

3. The trace finding tool as claimed in claim 1 or 2, wherein the top end of the grip (3) is a U-shaped clamping groove, the bottom end is a hand-held holding rod, and fastening screws (3-5) for fixedly connecting with the outer cylinder (2-1) are arranged on both sides of the top end of the U-shaped clamping groove; the middle part of the inner side of the U-shaped clamping groove is provided with a positioning pin (3-3), and the positioning pin (3-3) is inserted into a positioning hole of the outer cylinder (2-1).

4. A trace finding tool as claimed in claim 3, wherein an LED driving circuit is provided in the inner space (3-2) of the hand grip, and elastic electrode contacts (3-4) electrically connected to the LED driving circuit are provided on both sides of the positioning pin (3-3) for electrical connection with electrode posts (2-6) provided on both sides of the positioning hole of the outer cylinder (2-1).

5. The trace finding tool as claimed in claim 4, wherein a toggle switch (3-1) is provided on the outside of the hand grip, the toggle switch (3-1) being electrically connected to the LED driving circuit to control the wavelength band of the LED light source.