TWM526739U - Speed detector - Google Patents

Description

Speedometer

This creation is about a speedometer.

As the survival game players increase year by year, the BB bullet speedometers of different brands appear every year, so that the survival game players can understand the BB bombing speed of the air guns that are owned by the speedometer, and let the players and players modify the air gun power. The test data of the speedometer can be used to know whether the air gun is in compliance with regulations.

At present, most of the BB bullet speed detectors in the world use two sets of light sources and light receiving elements as sensing elements to cause the light receiving elements to generate signals in a manner that blocks the light source. When the BB bomb passes through the two sets of sensing elements to generate the occlusion signal, the micro control unit takes the two occlusion signals to convert the time difference, thereby calculating the initial velocity of the BB bomb and displaying it on the display.

However, at present, the speed measuring device using the above-mentioned shading sensing method has a phenomenon that the light emitted by the light source cannot be effectively concentrated in the detection range of the light receiving element, and the light is not evenly projected on each light receiving. The components are such that each of the light-receiving elements cannot obtain uniform light intensity and sensitivity, causing some of the light-receiving elements to sense failure. Therefore, some BB bullet speedometers on the market hide the lack of speed insensitivity, and the light is projected on Problems such as loss of non-sensing range.

Therefore, how to propose a speedometer that can solve the above problems is one of the problems that the industry is eager to invest in research and development resources.

In view of this, one of the purposes of this creation is to propose a speedometer that allows all light sensors to achieve a high and consistent light intensity, resulting in consistent sensitivity for each light sensor.

In order to achieve the above object, in accordance with one embodiment of the present invention, a speedometer is used to sense the speed of an object. The speedometer includes a first circuit board, a plurality of first photo sensors, a second circuit board, a first light source, and a first lens. The first photo sensor is disposed on the first circuit board and arranged along the first direction. The second circuit board is parallel to the first circuit board. The first light source is disposed on the second circuit board and substantially illuminates toward the first photo sensor. When any of the first photo sensors senses that the object blocks the light emitted by the first light source, the first shading signal is correspondingly generated. The first lens is disposed between the first light source and the first light sensor and configured to uniformly diverge the light emitted by the first light source along the first direction.

In one or more embodiments of the present invention, the speedometer described above further includes a housing. The housing has a passage and two first through holes. The channel is configured for the object to pass. The first through holes respectively communicate with opposite sides of the channel and are located between the first light source and the first photo sensor. The first circuit board and the second circuit board are disposed in the housing.

In one or more embodiments of the present invention, the first lens is further configured to align the light emitted by the first light source parallel to the first circuit board and A second direction perpendicular to the first direction converges, causing the light emitted by the first source to be projected onto the first elongated region on the first circuit board. The first elongate region encompasses the first photosensor.

In one or more embodiments of the present invention, the first lens is further configured to uniformly map the light beams emitted by the first light source to a plurality of positions in the first elongated area.

In one or more embodiments of the present invention, the housing further includes two second through holes respectively communicating with opposite sides of the channel. The speedometer further includes a plurality of second light sensors, a second light source, and a processing unit. The second photo sensor is disposed on one of the first circuit board and the second circuit board and arranged along the first direction. The second light source is disposed on the other of the first circuit board and the second circuit board, and substantially emits light toward the second photo sensor via the second through hole. When any of the second photosensor sensing objects intercepts the light emitted by the second light source, the second shading signal is correspondingly generated. The processing unit is electrically connected to the first photo sensor and the second photo sensor, and configured to calculate the speed of the object according to the first shading signal and the second shading signal.

In one or more embodiments of the present invention, the speedometer further includes a second lens. The second lens is disposed between the second light source and the second light sensor and configured to uniformly diverge the light emitted by the second light source along the first direction.

In one or more embodiments of the present invention, the second lens is further configured to converge the light emitted by the second light source in a second direction, so that the light emitted by the second light source is projected onto the first circuit board and the first The second strip-shaped area on the second circuit board is disposed in the second circuit board. Second long strip Cover the second light sensor.

In one or more embodiments of the present invention, the second lens is further configured to uniformly map the light emitted by the second light source to a plurality of positions in the second elongated area.

In one or more embodiments of the present invention, the light exiting surface of at least one of the first lens and the second lens is a flat surface.

In one or more embodiments of the present invention, the first light source and the first light sensor are located on the first reference surface. The second light source and the second light sensor are located on the second reference surface. The first reference surface and the second reference surface are perpendicular to the first circuit board and the second circuit board.

In summary, the proposed speedometer mounts a secondary optical lens at the light source end, and its function is to refract the circular spot projected by the light source and project it in a strip-shaped area to completely cover the light sensing. Device. Thereby, the efficiency of the light source can be effectively improved (relatively, power saving). Moreover, the secondary optical lens can also homogenize the light intensity of all the light rays projected in the elongated region, thereby effectively allowing the light sensor to obtain a higher uniform light intensity, thereby enabling each light sensing The device gets consistent sensitivity.

The above description is only used to explain the problems to be solved by the present invention, the technical means for solving the problems, the effects thereof, and the like, and the specific details of the present invention will be described in detail in the following embodiments and related drawings.

100‧‧‧speedometer

110‧‧‧shell

111‧‧‧ channel

112‧‧‧First through hole

113‧‧‧Second through hole

120a‧‧‧First board

120b‧‧‧second board

130a‧‧‧First light sensor

130b‧‧‧Second light sensor

140a‧‧‧first light source

140b‧‧‧second light source

150a‧‧‧first lens

150a1, 150b1‧‧‧ shiny surface

150b‧‧‧second lens

160‧‧‧Processing unit

170‧‧‧ display

200‧‧‧ objects

A1‧‧‧ first direction

A2‧‧‧ second direction

P1‧‧‧ first reference surface

P2‧‧‧ second reference surface

Z1‧‧‧First long strip area

Z2‧‧‧Second strip area

To make the above and other objects, features, advantages and embodiments of the present invention more apparent, the description of the drawings is as follows: FIG. 1 is a perspective assembled view of a speedometer according to an embodiment of the present invention.

FIG. 2 is a perspective exploded view of the speedometer according to an embodiment of the present invention.

Figure 3 is a cross-sectional view showing a portion of the components of the speedometer of Figure 2 taken along line 3-3.

Figure 4 is a cross-sectional view showing a portion of the components of the speedometer of Figure 2 taken along line 4-3.

Fig. 5 is a front elevational view showing the second circuit board in Fig. 2.

Figure 6 is a schematic diagram showing the mapping of light rays from a first source to a particular location in a first elongated region via a first lens.

Fig. 7 is a perspective view showing the first lens (or the second lens) in Fig. 2.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings. For the sake of clarity, a number of practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the creation. That is to say, in the implementation part of this creation, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

Please refer to Figures 1 to 5. FIG. 1 is a perspective assembled view of a speedometer 100 according to an embodiment of the present invention. FIG. 2 is a perspective exploded view of the speedometer 100 according to an embodiment of the present invention. Figure 3 is a cross-sectional view showing a portion of the components of the speedometer 100 of Figure 2 taken along line 3-3. Figure 4 is a cross-sectional view showing a portion of the components of the speedometer 100 of Figure 2 taken along line 4-3. Fig. 5 is a front elevational view showing the second circuit board 120b in Fig. 2. The following will introduce the test in detail. The structure, function, and connection relationship between the components included in the speedometer 100.

As shown in Fig. 2, in the present embodiment, the speedometer 100 is used to sense the speed of the object 200 (see Fig. 3). The speedometer 100 includes a housing 110, a first circuit board 120a, a plurality of first photo sensors 130a, a second circuit board 120b, a first light source 140a, and a first lens 150a. The housing 110 has a channel 111 and two first through holes 112. Channel 111 is configured for passage of article 200. The first through holes 112 respectively communicate with opposite sides of the channel 111. The first photo sensors 130a are disposed on the first circuit board 120a and arranged along the first direction A1. The second circuit board 120b is parallel to the first circuit board 120a. The first light source 140 a is disposed on the second circuit board 120 b and substantially emits light toward the first photo sensor 130 a via the first through hole 112 (that is, the first through hole 112 is located at the first light source 140 a and the first light sensing Between the devices 130a). When any of the first photo sensors 130a senses that the object 200 blocks the light emitted by the first light source 140a, the first shading signal is correspondingly generated.

As shown in FIG. 4, in the present embodiment, the first lens 150a is disposed between the first light source 140a and the first photo sensor 130a, and is configured to direct the light emitted by the first light source 140a along the first The direction A1 is evenly diverged (ie, the light is evenly distributed again). It can be seen that, by the arrangement of the first lens 150a of the embodiment, the first light sensor 130a close to the first light source 140a can be used to solve the first light sensing that is stronger than the first light source 140a. The problem that the light intensity received by the device 130a is weak is further effective to allow the first photo sensor 130a to obtain a higher uniform light intensity, thereby enabling each first photo sensor 130a to obtain consistent sensitivity.

Further, as shown in FIGS. 3 and 5, in the present embodiment, The first lens 150a is further configured to converge the light emitted by the first light source 140a in a second direction A2 parallel to the first circuit board 120a and perpendicular to the first direction A1, so that the light emitted by the first light source 140a is projected to the first A first elongated region Z1 on a circuit board 120a. The first elongated strip region Z1 covers the first photo sensor 130a. Therefore, it can be seen that the efficiency of the first light source 140a (relatively, power saving) can be effectively improved by the arrangement of the first lens 150a of the present embodiment.

Further, the first lens 150a of the present embodiment is further configured to uniformly map the light beams emitted by the first light source 140a to a plurality of positions in the first elongated area Z1. That is to say, by allocating all the light emitted by the first light source 140a by the first lens 150a, the light intensity obtained by each position projected into the first elongated area Z1 is made uniform.

In some embodiments, the first lens 150a is fixed to the second circuit board 120b by means of a snapping (for example, by using the hook structure shown in FIG. 7), but the present invention is not limited thereto.

In practical applications, the manner in which the first lens 150a is manufactured can be accomplished by the methods described below, but the present invention is not limited thereto. First, the light shape of the light source can be numerically a function. For example, for convenience of representation, the shape of the light profile can be expressed in a very coordinate manner as A _{ψ, φ} , where A is related to the angle and is determined by the two angular directions ψ and φ.

Then, any value of A _{ψ, φ} of the optical profile, that is, any of the emitted light rays is projected onto a desired position (point) of the desired receiving surface (ie, the first circuit board 120a), and the position is located at the foregoing Within the first elongated strip zone Z1. The first elongated strip region Z1 is denoted by AxB. If it is desired to form a uniform light intensity (assumed to be T _o ) distribution in the first elongated strip region Z1, then under the same conditions of the light output and the received light energy (ie, in accordance with the law of energy inactivity), all energy transfer can be Expressed by the following equation:

Wherein F _A and F _B are the side lengths of the first elongated strip region Z1.

Assuming AxB is equal to 1, the above equation can be simplified to:

It can be seen from the above formula that there are many kinds of mapping corresponding to the possible existence. If you use the simplest and most efficient correspondence, you can make the mathematical relationship the most simplified. In the present embodiment, if each ray is to be projected to a specific position in the first elongated area Z1, this determines the boundary condition describing the partial differential equation of the first lens 150a, which is usually a nonlinearity. Partial differential equation.

Please refer to FIG. 6 , which is a schematic diagram showing that light is mapped by the first light source 140 a via the first lens 150 a to a specific position in the first elongated strip region Z1 . As shown in Fig. 6, X _F , Y _F , Z _F are the positions of the light source, X ₀ , Y ₀ , Z ₀ are points on the lens, and X ₂ , Y ₂ , Z ₂ are the light receiving surfaces (ie, the first length A point on the stripe region Z1), n _i , n ₀ , n ₂ are refractive indices, respectively. Currently n _i =n ₂ =1 (air) and n ₀ = 1.586 (polycarbonate). , , The unit vector for the light path. The light source is represented by a polar coordinate system, and the light receiving surface is represented by a rectangular coordinate system. The general formula is as follows: on the light incident surface (for example, a plane):

On the light surface (for example, the surface):

among them, For the light vector.

The geometry of the first lens 150a can be obtained by solving the simultaneous partial differential equations of the above two equations. This nonlinear simultaneous partial differential equation has no exact solution, so a numerical method is used to solve the solution, and the convergence condition is sufficient to obtain the correct geometry. Through the above three steps, the design and manufacture of the first lens 150a can be realized.

In some embodiments, the foregoing object 200 is a BB bomb, but the creation is not limited thereto.

In some embodiments, the first light source 140a is an infrared light source, and the first light sensor 130a is an infrared light sensor, but the present invention is not limited thereto.

Returning to FIG. 2 and FIG. 3 , in the embodiment, the housing 110 further includes two second through holes 113 respectively communicating with opposite sides of the channel 111 . The speedometer 100 also includes a plurality of second light sensors 130b, a second light source 140b, a processing unit 160 (see FIG. 5), and a display 170. The second photo sensor 130b is disposed on the first circuit board 120a and arranged along the first direction A1. The second light source 140b is disposed on the second circuit board 120b and substantially emits light toward the second photo sensor 130b via the second through hole 113. When any of the second photo sensors 130b senses that the object 200 blocks the light emitted by the second light source 140b, the second shading signal is correspondingly generated. Therefore, in the present embodiment, the first light sensor 130a and the second light sensor 130b are both disposed on the first circuit board 120a, and the first light source 140a and the second light source 140b are both disposed in the second On the circuit board 120b.

Moreover, as shown in FIG. 3, the first light source 140a and the first photo sensor 130a are located on the first reference surface P1. The second light source 140b and the second photo sensor 130b are located on the second reference surface P2. First reference plane P1 and second reference plane P2 It is perpendicular to the first circuit board 120a and the second circuit board 120b. The processing unit 160 is electrically connected to the first photo sensor 130a and the second photo sensor 130b, and configured to calculate the speed of the object 200 according to the first shading signal and the second shading signal. Specifically, the processing unit 160 calculates the initial velocity of the object 200 by the time difference between the first shading signal and the second shading signal, and displays the value of the speed on the display 170.

In some embodiments, the positions of the second photosensor 130b and the second light source 140b illustrated in FIGS. 2 and 3 may also be mutually adjusted. That is, the first light sensor 130a and the second light source 140b are disposed on the first circuit board 120a, and the first light source 140a and the second light sensor 130b are disposed on the second circuit board 120b.

In some embodiments, as shown in FIG. 5, the processing unit 160 is disposed on the first circuit board 120a, but the present invention is not limited thereto.

Further, as shown in FIGS. 3 and 5, in the present embodiment, the speedometer 100 further includes a second lens 150b. The second lens 150b is disposed between the second light source 140b and the second light sensor 130b, and is configured to uniformly diverge the light emitted by the second light source 140b along the first direction A1. Thereby, the second lens 150b of the present embodiment can also effectively enable the second photo sensor 130b to obtain a higher uniform light intensity, thereby enabling each second photo sensor 130b to obtain uniform sensitivity.

In some embodiments, the second lens 150b is further configured to converge the light emitted by the second light source 140b in the second direction A2, such that the light emitted by the second light source 140b is projected onto the second length of the first circuit board 120a. Strip area Z2. The second elongated strip region Z2 covers the second photo sensor 130b. This shows that With the arrangement of the second lens 150b of the present embodiment, the efficiency of the second light source 140b (relatively, power saving) can also be effectively improved.

Further, the second lens 150b of the present embodiment is further configured to uniformly map the light beams emitted by the second light source 140b to a plurality of positions in the second elongated strip region Z2. That is to say, by allocating all the light emitted by the second light source 140b by the second lens 150b, the light intensity obtained by each position projected into the second elongated strip region Z2 can be made uniform.

In some embodiments, the second lens 150b is fixed to the second circuit board 120b by means of snapping (for example, by using the hook structure shown in FIG. 7), but the present invention is not limited thereto.

In the actual application, the manufacturing method of the second lens 150b can also be completed through the foregoing description, and details are not described herein, but the present invention is not limited thereto.

In some embodiments, the second light source 140b is an infrared light source, and the second light sensor 130b is an infrared light sensor, but the present invention is not limited thereto.

Please refer to FIG. 7 , which is a perspective view showing the first lens 150 a (or the second lens 150 b ) in FIG. 2 . As shown in FIG. 7, in the present embodiment, the light-emitting surfaces 150a1 and 150b1 of the first lens 150a (or the second lens 150b) are flat, but the present invention is not limited thereto. Thereby, the light-emitting surfaces 150a1 and 150b1 of the first lens 150a (or the second lens 150b) are planar, and the difficulty of copying the first lens 150a (or the second lens 150b) by reverse engineering or the like can be increased. .

From the above detailed description of the specific implementation of the creation, It is obvious that the tachometer of the present invention mounts a secondary optical lens on the light source end, and the function is to refract the circular spot projected by the light source and project it in a strip-shaped area to completely cover the light sensing. Device. Thereby, the efficiency of the light source can be effectively improved (relatively, power saving). Moreover, the secondary optical lens can also homogenize the light intensity of all the light rays projected in the elongated region, thereby effectively allowing the light sensor to obtain a higher uniform light intensity, thereby enabling each light sensing The device gets consistent sensitivity.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present creation. The scope is subject to the definition of the scope of the patent application.

100‧‧‧speedometer

110‧‧‧shell

111‧‧‧ channel

112‧‧‧First through hole

113‧‧‧Second through hole

120a‧‧‧First board

120b‧‧‧second board

130a‧‧‧First light sensor

130b‧‧‧Second light sensor

150a‧‧‧first lens

150b‧‧‧second lens

170‧‧‧ display

A1‧‧‧ first direction

A2‧‧‧ second direction

Claims (10)

A speed measuring device for sensing a speed of an object, the speed measuring device comprising: a first circuit board; a plurality of first light sensors disposed on the first circuit board and arranged along a first direction a second circuit board parallel to the first circuit board; a first light source disposed on the second circuit board and substantially illuminating toward the first photo sensors, wherein any one of the first When the light sensor senses that the object blocks the light emitted by the first light source, correspondingly generates a first light shielding signal; and a first lens disposed on the first light source and the first light senses Between the detectors, and configured to uniformly scatter the light emitted by the first light source along the first direction. The speedometer according to claim 1, further comprising: a casing having a passage and two first through holes configured to pass the object, wherein the first through holes respectively communicate with the opposite sides of the passage Two sides are located between the first light source and the first photo sensors, and the first circuit board and the second circuit board are disposed in the housing. The speedometer of claim 2, wherein the first lens is further configured to direct the light rays emitted by the first light source along a direction parallel to the first circuit board and perpendicular to the first direction The direction converges, causing the light emitted by the first light source to be projected onto the first length of the first circuit board a strip area, and the first strip area covers the first photo sensors. The speedometer of claim 3, wherein the first lens is further configured to uniformly map the light rays emitted by the first light source to a plurality of positions in the first elongated strip region. The speedometer of claim 4, wherein the housing further comprises two second through holes respectively communicating with opposite sides of the channel, the speedometer further comprising: a plurality of second light sensors disposed on the One of the first circuit board and the second circuit board is arranged along the first direction; a second light source is disposed on the other of the first circuit board and the second circuit board, and substantially Illuminating toward the second photo sensors via the second through holes, wherein when any of the second photo sensors senses that the object blocks the light emitted by the second light source, correspondingly Generating a second light-shielding signal; and a processing unit electrically connected to the first light sensor and the second light sensor, and configured to calculate according to the first light-shielding signal and the second light-shielding signal The speed of the object. The speedometer of claim 5, further comprising: a second lens disposed between the second light source and the second light sensors, and configured to emit the second light source The rays diverge uniformly along the first direction. The speedometer of claim 6, wherein the second The lens is further configured to converge the light emitted by the second light source in the second direction, such that the light emitted by the second light source is projected onto the first circuit board and the second circuit board is disposed One of the second photosensors is a second elongated strip region, and the second elongated strip region covers the second photosensors. The speedometer of claim 7, wherein the second lens is further configured to uniformly map the light rays emitted by the second light source to a plurality of positions in the second elongated strip region. The speedometer of claim 8, wherein the light exiting surface of at least one of the first lens and the second lens is a plane. The speedometer according to claim 9, wherein the first light source and the first light sensors are located on a first reference surface, and the second light source and the second light sensors are located at a first The first reference surface and the second reference surface are perpendicular to the first circuit board and the second circuit board.