CN218851041U

CN218851041U - Circuit board device for instrument

Info

Publication number: CN218851041U
Application number: CN202222961303.2U
Authority: CN
Inventors: 周剑华; 庞涯
Original assignee: Locosc Ningbo Precision Technology Co ltd
Current assignee: Locosc Ningbo Precision Technology Co ltd
Priority date: 2022-10-15
Filing date: 2022-11-03
Publication date: 2023-04-11
Anticipated expiration: 2032-11-03

Abstract

The utility model relates to a circuit board device for instrument, include: the PCB board is provided with a plurality of luminous bodies and control keys which are distributed at intervals; the shading frame is provided with light holes which penetrate through the shading frame and are distributed at intervals, and the light holes are combined to form a preset pattern. And the printing film paper is connected with the shading frame in an adhesive manner and seals one end of the light hole, and the printing film paper is provided with a light-transmitting pattern corresponding to the light hole. The shading frame is attached to the PCB, each luminous body extends into the corresponding light hole, and the control keys and the shading frame are arranged at intervals. The printing film paper can print different light-transmitting patterns so as to adapt to weighing instruments with different display requirements, and the application effect is good. The shading frame separates different luminophors on the PCB board to make its middle part luminophor of PCB board control give out light, thereby show different figures or graphic information, the light efficiency is good. The luminous body can independently maintain, and the maintenance cost is low.

Description

Circuit board device for instrument

Technical Field

The utility model relates to an instrument technical field especially relates to a circuit board device for instrument.

Background

The existing weighing instrument is provided with a shell and a circuit board device arranged in the shell, wherein the circuit board device is electrically connected with a sensor on a weighing platform so as to output the weight information of an object to be weighed on the weighing platform.

For example, chinese patent CN105203197A discloses an electronic weighing instrument, which comprises a housing main body, a main circuit board, a key mask, a power switch and a socket, a communication interface circuit board, a weight detection and quantitative control input/output circuit board; the main circuit board is arranged in the shell main body, the main circuit board is respectively connected with the communication interface circuit board, the power switch and the socket, and the weight checking and quantitative control input and output circuit board, the communication interface circuit board, the power switch and the socket are installed behind the shell main body in a plug-in mode, the shells on two sides of the shell main body are installed, the bottom of the shell main body is provided with a shell bottom plate, and the other side of the shell bottom plate is also provided with an additional instrument support.

In a weighing instrument with LED display, a circuit board device is assembled with an LED display module on a PCB. The LED display module is a packaged component and is connected to the PCB through the pins in a soldering mode, so that not only is the welding efficiency low, but also partial lamp beads of the LED display module are damaged, the whole replacement is needed, the maintenance cost is high, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that exists among the correlation technique, the embodiment of the utility model provides a circuit board device for instrument.

According to the utility model discloses an aspect provides a circuit board device for instrument, include:

the PCB board is provided with a plurality of luminous bodies and control keys which are distributed at intervals;

the shading frame is provided with light holes which penetrate through the shading frame and are distributed at intervals, and a plurality of light holes are combined to form a preset pattern;

the printing film paper is connected to the shading frame in an adhesive manner and seals one end of the light hole, and the printing film paper is provided with a light-transmitting pattern corresponding to the light hole; wherein the content of the first and second substances,

the shading frame is attached to the PCB, each luminous body extends into the corresponding light-transmitting hole, and the control keys and the shading frame are arranged at intervals.

In one embodiment, the printing film paper comprises a diffusion film layer and a light-tight printing layer, the light-tight patterns are hollow areas distributed on the printing layer at intervals, each hollow area comprises a pattern and/or a number formed by combining a plurality of line segments or curves, and the hollow areas correspond to the light-tight holes.

In an embodiment, the printing film paper further comprises a back adhesive layer, the back adhesive layer and the diffusion film layer are arranged in a back-to-back mode, and the back adhesive layer avoids the hollow area.

In an embodiment, the light shielding frame includes a surface mount portion having a film mounting plane and a plurality of light shielding rings protruding from the surface mount portion, the light transmission hole is located in a surrounding area of the light shielding rings, a tail end of the light shielding ring abuts against the PCB, the light emitting body is located in the surrounding area of the light shielding rings, and the printed film paper is adhered to the film mounting plane.

In an embodiment, the light shielding frame further includes a plurality of inserting columns protruding from the surface mount part at intervals, the protruding height of the inserting columns is greater than the protruding height of the light shielding ring, and the inserting columns are inserted and positioned with the PCB.

In one embodiment, the tail end of the insertion column is thermally deformed to form a hooking portion, and the hooking portion is hooked on the PCB.

In one embodiment, the shading frame comprises an edge rib protruding around the edge of the surface patch, and all the shading rings are positioned in the surrounding area of the edge rib.

In one embodiment, the light adjusting device further comprises a light adjusting frame made of colored transparent materials, and the light adjusting frame is located in the light transmission direction of the printed film paper.

In one embodiment, the light adjusting frame is covered on the shading frame; or the light adjusting frame covers the printing film paper.

In an embodiment, the power supply module further comprises a signal connector, a power connector and an energy storage unit, wherein the signal connector, the power connector and the energy storage unit are electrically connected to the PCB board, and the power connector is configured as a USB interface.

The embodiment of the utility model provides a technical scheme can include following beneficial effect: the printing film paper can print different light-transmitting patterns so as to adapt to weighing instruments with different display requirements, and the application effect is good. The shading frame separates different luminophors on the PCB board to make its middle part luminophor of PCB board control give out light, thereby show different figures or graphic information, the light efficiency is good. The luminous body can independently maintain, and the maintenance cost is low.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram illustrating a wiring board arrangement for a meter according to an exemplary embodiment.

Fig. 2 is an exploded view of a wiring board arrangement according to an exemplary embodiment.

Fig. 3 is a schematic structural view of a shading frame according to an exemplary embodiment.

FIG. 4 is a schematic front view of a printed film paper shown according to an exemplary embodiment.

In the figure, a PCB board 10; a light emitting body 11; a control key 12; a shade frame 20; a light-transmitting hole 21; a face-attaching portion 22; a light-shielding ring 23; a plug-in column 24; edge beads 25; printing the membrane paper 30; a light-transmitting pattern 31; a light transmission number 311; a diffusion film layer 32; a print layer 33; a light-shielding region 331; a light-adjusting mount 40; a signal connector 50; a power connector 60; an energy storage unit 70.

Detailed Description

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but not for indicating or implying that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations of the present patent, and specific meanings of the above terms can be understood according to specific situations by those of ordinary skill in the art.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected through any combination of two or more members or structures. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, the utility model provides a circuit board device for instrument, this circuit board device for instrument are used for the instrument of weighing, and this instrument of weighing is arranged in the weighing-appliance, and this weighing-appliance includes platform scale, weighing module and other weighing device.

The circuit board device comprises a PCB (printed circuit board) 10, a shading frame 20 and printed film paper 30, wherein the PCB 10 is provided with a plurality of luminous bodies 11 and control keys 12 which are distributed at intervals. The luminous body 11 and the PCB 10 are processed through a chip mounting process, the chip mounting processing of the luminous body 11 is completed when other electrical elements of the PCB 10 are prepared, the chip mounting position precision is high, and the processing effect is good. The position of the light emitting body 11 on the PCB 10 is adapted to the position of the light source, e.g. the circuit board device needs to display a plurality of light sources arranged in parallel "

"region of the font display, correspondingly," based on the status of the font display>

The character form is formed by combining seven line segments, and one to two luminous bodies 11 are arranged at the position of the PCB 10 corresponding to each line segment. Optionally, the light 11 is configured as an LED lamp. The luminous bodies 11 can be processed and welded on the PCB 10 through a surface mounting process, the processing efficiency is high, the single luminous body 11 can be maintained, and the maintenance cost is low.

The light shielding frame 20 has light holes 21 penetrating through and distributed at intervals, and the light holes 21 are combined to form a preset pattern. The light shielding frame 20 is a rigid structural member made of opaque material, for example, the light shielding frame 20 is formed by injection molding of plastic material, so that the overall dimensional accuracy is high and the processing efficiency is high.

The light holes 21 penetrate through the shading frame 20, and adjacent light holes 21 are separated by the hole wall and cannot be mutually mixed. The light shielding frame 20 is a plate-shaped or block-shaped structure, and the light holes 21 are distributed at intervals along the length direction of the light shielding frame 20 so as to conform to digital display contents to be displayed by the circuit board device. Alternatively, the shape of at least a part of the light holes 21 on the shading frame 20 can be flexibly adjusted according to the actual display requirements, for example, the light holes 21 can be configured as long holes, round holes, trapezoidal holes, polygonal holes, etc. Alternatively, seven long-hole-shaped light-transmitting holes 21 are "

The figure display areas are distributed in a shape like a Chinese character 'ji', and a plurality of the same figure display areas are distributed along the length direction of the PCB 10 to display different figures together, and two adjacent light holes 21 are separated by a hole wall. In particular, six "are distributed in the longitudinal direction of the shading frame 20>

The light-transmitting number 311 is distributed in a shape of Chinese character 'ji', and the light-transmitting holes 21 in a shape of round holes or rectangles are arranged on the side and/or below the light-transmitting number 311 to form numerical information with different display accuracies, for example, the light-transmitting holes 21 in the shape of round holes are displayed as decimal points.

The printing film paper 30 is connected to the light shielding frame 20 by adhesive bonding and closes one end of the light transmission hole 21, and the printing film paper 30 has a light transmission pattern 31 corresponding to the light transmission hole 21. The printing film 30 has a film structure, wherein the printing portion of the printing film 30 is an opaque region, and the non-printing portion of the printing film 30 forms a transparent pattern 31. Optionally, the printing film 30 is attached to the surface of the shade frame 20 for easy replacement and alignment. For example, the printing film 30 is provided with a back adhesive layer coated with an adhesive. The back adhesive layer is connected with the shading frame 20 by adhesive joint, so that the rapid assembly or replacement can be realized. Optionally, the surface of the shading frame 20 is coated with an adhesive, and the printed film paper 30 directly adheres to the adhesive fixed on the surface of the shading frame 20, so that the printed film paper 30 is adhesively fixed on the shading frame 20.

The shading frame 20 is attached to the PCB 10, each light emitting body 11 extends into the corresponding light hole 21, and the plurality of control keys 12 are spaced from the shading frame 20. The shading frame 20 and the PCB 10 are arranged separately, thereby facilitating the overhaul and installation of the PCB 10. The light rays emitted by the corresponding luminous bodies 11 in the guide holes of the light-transmitting holes 21 are transmitted through the printed film paper 30, so that the corresponding light-transmitting patterns 31 are displayed, the light-transmitting patterns 31 comprise weighing numbers and other parameter information, the display effect is good, the printed contents of the printed film paper 30 are convenient to replace, and the light-transmitting patterns can be adapted to the display requirements of different circuit board devices for instruments. The printing film paper 30 can print different light-transmitting patterns 31 so as to be suitable for outputting weighing instruments with different display requirements, and the application effect is good.

In some embodiments, the printed film 30 includes a diffusion film 32 and a light-tight printed layer 33, and the light-tight patterns 31 are hollow areas spaced apart from the printed layer 33, and the hollow areas include patterns and/or numbers formed by combining a plurality of line segments or curves. The diffusion film layer 32 has a function of diffusing light, wherein the light penetrates through the diffusion layer using PET as a substrate and passes through a medium with a refractive index different from that of the PET, so that a plurality of refraction, reflection and scattering phenomena occur in the light, and the light can be corrected to form a uniform surface light source to achieve an optical diffusion effect. The light emitted by the light emitting body 11 can become a secondary light source with larger area, better uniformity and stable chromaticity after being diffused by the diffusion material.

The printing layer 33 is disposed on one side surface of the diffusion film layer 32, so as to be coated on the surface of the diffusion film layer 32 by a non-transparent printing material, thereby forming the light-shielding region 331 and the light-transmitting patterns 31 in the hollow areas. The hollow area corresponds to the light hole 21, and the hole wall of the light hole 21 limits the light emitted by the light emitting body 11 to the orifice area where the light hole 21 and the diffusion film layer 32 intersect, so that the light emitting brightness of the light on the light transmission pattern 31 in the orifice area is basically consistent, and the lighting effect is good.

Preferably, the printed layer 33 is printed with six "

The light-transmitting numbers 311 distributed in a shape, the unit letter symbols of the standard metering units positioned below the light-transmitting numbers 311, the indicator light symbols positioned on one side of the light-transmitting numbers 311 and the circular light-transmitting holes 21 are used for indicating the working state of the circuit board device for the instrument, and the light-transmitting number device is flexible to manufacture and convenient to replace. The light-transmitting number 311 is composed of seven strip lines, and corresponds to seven light-transmitting holes 21 on the light-shielding frame 20, and at least one light-emitting body 11 is arranged in each light-transmitting hole 21.

Further, the back adhesive layer of the printing film paper 30 is back to back arranged with the diffusion film layer 32, and the back adhesive layer avoids the hollowed-out area. The gum layer is the colloid that coats in diffusion rete 32 surface, and this colloid and shading frame 20 cementing are connected to make printing membrane paper 30 can replace, and, printing membrane paper 30 direct fixation shading frame 20, convenient assembling.

The shading frame 20 is a rigid supporting member, and covers the light emitting body 11 and the connecting printing film paper 30. In one embodiment, the light shielding frame 20 is a plate-shaped structure, and the light hole 21 is a hole structure penetrating through the light shielding frame 20. In one embodiment, the shading frame 20 includes a plurality of shading rings 23 having a surface attaching part 22 for attaching a film and a protruding surface attaching part 22, and the light transmission holes 21 are located in the surrounding area of the shading rings 23. The shading ring 23 is an annular rib structure, and is arranged opposite to the film sticking plane of the surface sticking part 22. Optionally, the size of the light-transmitting hole 21 is smaller than or equal to the inner diameter size of the light-shielding ring 23 to define a light-transmitting area on the light-shielding frame 20. For example, the light transmission hole 21 is a rectangular long hole, the light shielding ring 23 is a polygonal annular rib, and the size of the light transmission hole 21 is smaller than the size of the surrounding area of the light shielding ring 23. Alternatively, the shape of the light transmission hole 21 is the same as the shape of the surrounding area of the light shielding ring 23. Each light hole 21 and the printing film paper 30

In the present embodiment, the shade holder 20 has the surface attachment portion 22 of the plate-shaped portion and the shade ring 23 of the rib portion, thereby improving the overall bending strength of the shade holder 20 and improving the accuracy of the size and shape. And the material consumption of the shading frame 20 can be reduced, and the cost is saved.

The film sticking plane is arranged on one surface of the surface sticking part 22, the bonding area of the printing film paper 30 and the film sticking plane is large, and the sticking flatness is high, so that light rays are diffused and emitted on the printing film paper 30 in a plane manner, and a self-luminous light source structure is formed.

The end of the light shielding ring 23 abuts against the PCB board 10, and the light emitting body 11 is located in the surrounding area of the light shielding ring 23. The shading rings 23 are of annular structures, and the peripheral walls of two adjacent shading rings 23 are provided with connecting ribs so as to combine the shading rings 23 to form a latticed convex rib structure, thereby improving the strength of the whole bending and twisting resistant structure.

The light shielding frame 20 and the PCB board 10 may be directly connected to combine them into a whole. For example, a portion of the light shielding frame 20 is inserted into the PCB 10 to fixedly connect the two. Or, the shading frame 20 is provided with a pin which protrudes and has a barb, the PCB board 10 is provided with an insertion hole, and the shading frame 20 abuts against the surface of the PCB board 10, so that the pin is connected with the insertion hole in an inserting manner and the barb is locked.

Further, the light shielding frame 20 further includes a plurality of inserting posts 24 protruding from the surface mount portion 22 at intervals, the protruding height of the inserting posts 24 is greater than the protruding height of the light shielding ring 23, and the inserting posts 24 are inserted and positioned with the PCB board 10. The plug-in posts 24 are distributed at different positions of the shading frame 20 to co-locate the relative positions of the shading frame 20 and the PCB 10. The inserting column 24 aligns the light shielding frame 20 and the PCB board 10 to keep the light emitting bodies 11 corresponding to the light transmission holes 21 one by one, and a gap between the surface of the PCB board 10 and the end of the light shielding ring 23 is small to prevent lateral light leakage.

Preferably, the plug-in posts 24 are located in the gap between the edge ribs 25 of the light-shielding frame 20 and the light-shielding ring 23 to form independent columnar protrusions. Optionally, the inserting column 24 is provided with five columns, the five columns are distributed at intervals along the length direction of the light shielding frame 20, three columns are located on the upward side of the light shielding frame 20, and the other two columns are located on the downward side of the light shielding frame 20. Correspondingly, a plug hole is provided in the area of the PCB board 10 surrounding the light emitting body 11, and the plug column 24 is correspondingly plugged and positioned with the plug hole.

Preferably, the ends of the plug posts 24 are substantially flush with the surface of the PCB 10 or slightly protrude to form a plug positioning structure, which is convenient to replace and maintain. Preferably, the end of the plug column 24 extends beyond the surface of the PCB 10, and the end of the plug column 24 expands or plastically deforms under the action of heat to form a hook, so that the size of the hook is larger than the diameter of the plug hole, thereby fixing the light shielding frame 20 to the PCB 10.

Preferably, the shading frame 20 has a reflective coating attached to the inner sidewall of the shading ring 23 to improve the light reflection effect of the light emitting body 11. For example, the light shielding frame 20 is formed with a luminescent coating by means of chrome plating or the like.

The shading frame 20 comprises an edge convex rib 25 which is protruded around the edge of the surface pasting part 22, the edge convex rib 25 is protruded from the back surface of the surface pasting part 22 and is positioned at the edge of the surface pasting part 22, so that the shading frame 20 is of a plate-shaped structure, and the appearance is attractive. The edge bead 25 is of annular configuration with its outer side flush with the edge of the face patch 22, thereby improving the aesthetic appearance. All the shading rings 23 are positioned in the surrounding area of the edge convex rib 25 so as to shade the shading rings 23, and the concealment is good. Optionally, the shading ring 23 and the edge rib 25 are connected by a connecting rib to form a part of the net-shaped rib structure, so that the material reduction and the bending and twisting resistance are strong.

In one embodiment, the circuit board device further includes a light adjusting frame 40 made of a colored transparent material, and the light adjusting frame 40 is located in the light transmission direction of the printed film paper 30. The light adjusting frame 40 is located in front of the printed film paper 30, and the light transmitted from the printed film paper 30 passes through the light adjusting frame 40. The light adjusting frame 40 is used for changing the light effect of the light output by the printed film paper 30, for example, the light adjusting frame 40 is used for enhancing the brightness of the light output by the printed film paper 30; the light adjusting frame 40 is used for adjusting the lines of the light output by the printing film paper 30; the light adjusting frame 40 is used to change the color of light output from the printing film sheet 30.

The light adjusting frame 40 is made of colored transparent material, and can filter the interference of external light under the condition of strong external light, so that the light-transmitting graph 31 output by the circuit board device is clear. Preferably, the dimming stand 40 is configured as a brown transparent member, a red transparent member, a gray transparent member, etc. to achieve different light effects.

Preferably, the light adjusting frame 40 covers the light shielding frame 20, and the light adjusting frame 40 is configured to be a cover body structure, so that the light shielding frame 20 and the printed film paper 30 can be covered in a covering manner to protect the printed film paper from being interfered by foreign matters such as dust and water vapor, and the light effect of the light emitted by the printed film paper 30 can be adjusted.

Preferably, the light adjusting frame 40 covers the printed film 30, and the light adjusting frame 40 is positioned in front of the printed film 30 to adjust the luminous efficiency of the light emitted from the printed film 30. Preferably, the light adjusting frame 40 is a colored transparent plate, and the light adjusting frame 40 is attached to the printed film paper 30; alternatively, the light adjusting frame 40 is spaced apart from the printing film 30 to prevent external strong light from interfering with the display effect of the printing film 30.

In one embodiment, the circuit board device further includes a signal connector 50 electrically connected to the PCB 10, a power connector 60 and an energy storage unit 70, wherein the power connector 60 is configured as a USB interface. The signal connector 50 is used for externally connecting a sensor signal, and a processor provided in the PCB board 10 processes the sensor signal and outputs a corresponding control signal. The processor controls the corresponding luminous body 11 to emit light based on the control signal, and the printing film paper 30 displays different numbers based on the light of the luminous body 11, so that the display effect is good.

The power connector 60 is used for charging the energy storage unit 70, and the power connector 60 is configured as a USB interface to facilitate the conductive connection of the power connector 60. The charging wire application range that the USB connects the adaptation is wide, and it is nimble to charge.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A wiring board arrangement for a meter, comprising:

the printing film paper is connected to the shading frame in an adhesive mode and seals one end of the light hole, and the printing film paper is provided with a light-transmitting pattern corresponding to the light hole; wherein the content of the first and second substances,

the shading frame is attached to the PCB, each light-emitting body extends into the corresponding light-transmitting hole, and the control keys and the shading frame are arranged at intervals.

2. The circuit board device for an instrument according to claim 1, wherein the printed film paper includes a diffusion film layer and a light-tight printed layer, the light-tight patterns are hollow areas distributed at intervals on the printed layer, the hollow areas include patterns and/or numbers formed by combining a plurality of line segments or curves, and the hollow areas correspond to the light-tight holes.

3. The wiring board device for an instrument of claim 2, wherein the printed film paper further comprises a back adhesive layer, the back adhesive layer is disposed opposite to the diffusion film layer, and the back adhesive layer avoids the hollowed-out area.

4. The circuit board device for meters of claim 1, wherein the light shielding frame comprises a surface mount portion having a film mounting plane and a plurality of light shielding rings protruding from the surface mount portion, the light transmission holes are located in a surrounding area of the light shielding rings, ends of the light shielding rings abut against the PCB board, the light emitting bodies are located in the surrounding area of the light shielding rings, and the printed film paper is adhered to the film mounting plane.

5. The circuit board device for a meter according to claim 4, wherein the light shielding frame further comprises a plurality of plug posts protruding from the surface mount portion at intervals, the protruding height of the plug posts is greater than the protruding height of the light shielding ring, and the plug posts are inserted and positioned with the PCB.

6. A wiring board device for a meter according to claim 5, wherein the tail end of the plugging column is thermally deformed to form a hooking portion, and the hooking portion is hooked to the PCB board.

7. A circuit board arrangement for a meter according to claim 4, wherein the shading frame includes an edge bead projecting around the edge of the face patch, all of the shading rings being located within the surrounding area of the edge bead.

8. A wiring board device for a meter according to claim 1, further comprising a light-adjusting frame made of colored transparent material, said light-adjusting frame being located in a light transmission direction of said printed film paper.

9. The circuit board device for a meter according to claim 8, wherein the light-adjusting frame is covered on the light-shielding frame; or the light adjusting frame covers the printing film paper.

10. The circuit board device for meters of claim 1, further comprising a signal connector, a power connector and an energy storage unit electrically connected to the PCB board, wherein the power connector is configured as a USB interface.