CN100480576C - Lamp tube supporting structure - Google Patents

Abstract

The present invention provides a lamp tube support structure for use in a backlight module. The lamp tube support structure includes a base extending downward and two cantilevers. Each of the cantilevers has an inner arc edge and an opposite outer arc edge. Both extend upward from the base and define a receiving space. Each of the cantilevers has a top end to define an opening so that a lamp tube fits and can be received in the receiving space through the opening. A transverse dimension of the opening is smaller than a transverse dimension of the lamp tube. Each of the cantilevers has a first section. The first section has a top area and a bottom area. The bottom area extends upward from the base, and the cross section of the first section gradually decreases from the base toward the top area. The lamp tube support structure of the present invention can be applied to a large-sized backlight module to provide sufficient lamp tube clamping force and relatively reduce the combined thrust required when assembling the lamp tube on the support seat.

Description

Lamp support structure

technical field

The invention relates to a holder, in particular to a lamp tube support structure used in a backlight module.

Background technique

In recent years, with the rapid development of flat-panel displays, the size of flat-panel displays has gradually increased. Among them, under the requirement of increasing the size of the Direct Type backlight module applied to the liquid crystal display, in order to provide sufficient brightness of the light source, the length of the lamp tube in the module must also be increased accordingly. However, the excessively long lamp tube in a large-sized backlight module is prone to breakage during shock or vibration tests. In order to overcome this problem, in the prior art, several lamp support seats are added to the middle section of the lamp tube in the backlight module, as shown in FIG. Currently, in the prior art, there are various designs for the support seat of the lamp tube, one of which is shown in FIG. 2 . However, in practical applications, the lamp tubes often jump out of the support bases due to the lack of sufficient clamping force of these lamp tube support bases, resulting in varying degrees of damage to the lamp tubes, thereby affecting the brightness provided by the light source .

In view of this, in order to increase the clamping force of the lamp tube support base, there are prior technologies to increase the size of the support base to accommodate, but the result is that the combined thrust required for assembling the lamp tube on the support base is also relatively increased, increasing the lamp Combination difficulty between tube and support seat. Therefore, in order to cope with the growing trend of the diameter and length of the lamp tube in the backlight module, it is necessary to redesign the lamp tube support seat to provide sufficient lamp clamping force and relatively reduce the distance between the lamp tube and the support seat. combined thrust.

Contents of the invention

An object of the present invention is to provide a lamp tube support structure, which can be applied to a large-sized backlight module, provide sufficient clamping force for the lamp tube, and relatively reduce the required combination when assembling the lamp tube on the support base thrust.

According to the aforementioned purpose, the present invention provides a support structure for a lamp tube, which includes a base extending downward and two cantilever arms, each of which has an inner arc edge and an opposite outer arc edge, both of which extend upward from the base , and define an accommodating space, and each of the cantilevers has a top end to define an opening, so that a lamp tube is suitable and can be accommodated in the accommodating space through the opening, and a transverse dimension of the opening is smaller than the lamp A transverse dimension of the tube. Wherein, each of the cantilevers has a first section, the first section has a top end area and a bottom end area, the bottom end area extends upward from the base, and the cross section of the first section is defined by the base Tapering towards the top region. Any cross-section of the cantilever is perpendicular to the longitudinal axis direction C of the lamp tube, and any cross-section has a width h which is a maximum distance between the inner arc-shaped edge and the outer arc-shaped edge on any cross-section. The section has a thickness b which is the maximum length between the front and rear edges on any section, and any two sections A and B of the cantilever have the following relationship:

$1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ formula one

$1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ formula two

in,

h _A is the width of section A,

h _B is the width of section B,

b _A is the thickness of section A,

b _B is the thickness of section B,

L _A is the length from section A to the top of the lamp tube support structure,

L _B is the length from section B to the top of the lamp tube support structure.

According to the above-mentioned purpose, the present invention provides another lamp tube support structure, which comprises two upright cantilevers, each upright cantilever has a base, each of which cantilever has an inner edge and an opposite outer edge, and each upright cantilever has a base The base extends upwards and defines an accommodating space for the lamp tube. Each upright cantilever further includes a protruding structure, and the tops of the two protruding structures are used to define an opening, so that a light tube can fit and be accommodated in an accommodating space through the opening, and hold the accommodating space in the light tube. A transverse dimension of the opening is smaller than a transverse dimension of the lamp tube. Wherein, each of the cantilevers has a first section, each of the first sections has a top end area and a bottom end area, and the cross section of the first section gradually decreases toward the top end area. Any cross-section of the cantilever is perpendicular to the longitudinal axis direction C of the lamp tube, and any cross-section has a width h which is a maximum distance between the inner edge and the outer edge on any cross-section, and any cross-section has a thickness b is the maximum length between the front and rear edges on any section, and any two sections A and B of the cantilever have the following relationship:

$1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ formula one

$1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ formula two

in,

h _A is the width of section A,

h _B is the width of section B,

b _A is the thickness of section A,

b _B is the thickness of section B,

L _A is the length from section A to the top of the lamp tube support structure,

L _B is the length from section B to the top of the lamp tube support structure.

According to the above-mentioned scheme, the effect of the present invention relative to the existing structure is remarkable: when combining the lamp tube and the lamp tube support structure of the present invention, the pushed-in resistance of the lamp tube is relatively small, and once the lamp tube is assembled on the After the supporting structure, the clamping force of the lamp tube supporting structure of the present invention is relatively improved, that is, better clamping force of the lamp tube is provided, thereby avoiding the problem of unexpected lamp tube jumping described in the prior art.

Description of drawings

FIG. 1 is a schematic diagram of a lamp tube support seat provided in a backlight module in the prior art.

Fig. 2 is a schematic diagram of a lamp tube support seat in the prior art.

FIG. 3 is a schematic longitudinal sectional view of a lamp tube supporting structure for supporting the lamp tube of the backlight module in an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a lamp tube supporting structure in an embodiment of the present invention.

FIG. 5A is a schematic diagram of a computer simulation of stress distribution of a support structure of a lamp tube in the prior art.

FIG. 5B is a computer simulation schematic diagram of stress distribution of a lamp tube support structure in an embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a lamp tube supporting structure in another embodiment of the present invention.

Description of main component symbols

10: Lamp support structure 20: Base

22: Embedded part 24: Seat body

30: Cantilever 301: Top

32: Raised structure 321: Top of raised structure

40: First section 42: Bottom area

44: top area 50: second section

52: Bottom area 54: Top area

60: Guiding Department 100: Backplane

120: Accommodating space 140: Opening

200: light tube

Detailed ways

In order to make the above-mentioned purpose, technical features and advantages of the present invention more comprehensible, the following is a detailed description of preferred embodiments with accompanying drawings.

Please refer to FIG. 3 , which is a schematic longitudinal section view of a light tube supporting structure for supporting the light tube of a backlight module in an embodiment of the present invention. The lamp support structure 10 of the present invention mainly includes a base 20 and two cantilever arms 30. The lamp support structure 10 is made of non-metallic materials, such as plastic materials, to avoid local uneven temperature. Wherein, the base 20 has an embedding portion 22 and a seat body 24, the embedding portion 22 extends downwards, and is suitable for and can be embedded into a back plate 100 of a backlight module (not shown), so that the whole lamp support structure 10 is conveniently set up firmly. on the backplane 100. After the embedded lamp tube support structure 10, except for the embedded part 22, the main parts of the other structures, including the base body 24 and two cantilever arms 30, are arranged on the back plate 100 to provide a stable clamping of the lamp in the backlight module. The main function of the tube 200.

Secondly, the two cantilevers 30 of the lamp support structure 10 of the present invention are a nearly semi-arc-shaped cantilever beam (cantilever beam), respectively extending upwards from the seat body 24 of the base 20 on the back plate 100, to jointly define a The accommodating space 120 is used for accommodating the lamp tube 200 . Wherein, each cantilever 30 has a top end 301 on the opposite side of the base body 24 , and has an inner arc edge and an opposite outer arc edge. The two top ends 301 of the two cantilever arms 30 jointly define an opening 140 , which can facilitate the light tube 200 to fit and be accommodated in the accommodating space 120 through the opening 140 . It should be noted that the opening 140 has a minimum lateral dimension O, which is smaller than a lateral dimension R (that is, the diameter of the lamp tube) of the lamp tube 200, so that the lamp tube support structure 10 can stably accommodate the lamp tube in the accommodating Space 120.

In specific applications, in the lamp support structure 10 disclosed in the present invention, each cantilever 30 further has at least one protruding structure 32 extending inward from the inner arc edge for clamping and accommodating in the accommodating space 120 The lamp tube 200.

One of the features of the lamp support structure 10 of the present invention is to strengthen the structural strength of the cantilever 30 to provide a larger clamping force of the cantilever 30 and better uniform stress distribution. Specifically, in the embodiment of the present invention, each cantilever 30 has a first section 40 and a second section 50 . Wherein, the first section 40 has a bottom region 42 and a top region 44 , as shown by the dotted line in FIG. 3 . The bottom region 42 extends upward from the base body 24 , and the top region 44 of the first section 40 is adjacent to the bottom region 42 . One of the characteristics of the lamp support structure 10 of the present invention is that the cross-section of the first section 40 of each cantilever 30 has a gradual area change. The end region 42 tapers in the direction of the tip region 44 .

On the other hand, the second section 50 of the lamp support structure 10 of the present invention continues to extend upwards from the top area 44 of the first section 40 of the cantilever 30, and the second section 50 also includes a bottom area 52 and a tip region 54 . Specifically, the bottom region 52 of the second section 50 is adjacent to the top region 44 of the first section 40 , and the top region of the second section 50 is adjacent to the top 301 of the lamp support structure 10 .

In this embodiment, different from the aforementioned first section 40 , the second section 50 of each cantilever 30 has a uniform cross section. However, in order to make the lamp tube supporting structure 10 disclosed in the present invention have better clamping force and uniform force distribution, the length of the first section 40 with a changing cross-sectional area in each cantilever 30 of the present invention must be at least 1/3 of the total length of the cantilever 30 provides better cantilever elasticity with uniform stress distribution. In other words, the higher the ratio of the first section 40 with a changing cross-sectional area to the overall cantilever length, the better uniform stress distribution and elasticity can be provided. The cross-sectional variation of the first section will be described in detail below.

The present invention concludes that the cross-sectional area change of the first section 40 must comply with the following cross-sectional relational formula from the verification results of theoretical analysis such as comprehensive structure and material mechanics and actual tests, in order to achieve the aforementioned object of the present invention. In the present invention, The cross-section can be a rectangular cross-section, a circular cross-section or a cross-section of any shape, and the relational formula of the present invention is applicable to cross-sections of any shape.

Taking the rectangular cross-section of the first section 40 of the cantilever 30 as an example, please refer to FIG. The section has a thickness (b) and a width (h). Wherein, the thickness (b) is a maximum distance between front and rear edges on a rectangular section, and the width (h) is a maximum distance between an inner arc edge and an outer arc edge on any rectangular section. Any two cross-sections (represented by cross-section A and cross-section B) in the first section 40 of this embodiment have the relationship shown in formula 1 and formula 2:

$1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ (Formula 1)

Wherein, h _A in the above formula is the width of section A, and h _B is the width of section B. L _A is the length from section A to the top of the lamp tube support structure. L _B is the length from section B to the top of the lamp tube support structure.

$1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ (Formula 2)

Wherein, b _A is the thickness of the section A, b _B is the thickness of the section B, and the rest have the same definition as the aforementioned formula 1.

时，悬臂底部区域过大，不易挠曲变形，导致整体刚性过强，因而使灯管与支撑座接触面压力过大，反而产生材料破坏等非预期性效果，并因而造成悬臂第二区段产生过多的塑性变形。而且，需强调的是，第一区段占整体悬臂总长度的比例不宜低于1/3，否则塑性变形仍然会集中于底座区域。Based on the above, the present invention can adapt to different cantilever cross-sections in the lamp tube support structure 10, and provide appropriate adjustments to the variation ratio of the cantilever cross-sections to achieve uniform stress distribution of each cantilever and appropriately increase the elastic strength of each cantilever . Taking Formula 1 as an example, when the thickness variation of the section is substantially close to

When the bottom area of the cantilever is too large, it is not easy to bend and deform, resulting in too strong overall rigidity, so that the pressure on the contact surface between the lamp tube and the support seat is too large, and unexpected effects such as material damage occur instead, and thus the second section of the cantilever Excessive plastic deformation occurs. Moreover, it should be emphasized that the ratio of the first section to the total length of the cantilever should not be lower than 1/3, otherwise the plastic deformation will still be concentrated in the base area.

Please refer to FIG. 5A and FIG. 5B , which are computer simulation diagrams of the prior art and an embodiment of the present invention, which are used to simulate the stress distribution of the prior art and the present invention under the same tube diameter.

Wherein, FIG. 5A is a computer simulation schematic diagram of the stress distribution of the support structure of the lamp tube with a uniform cross section in the prior art. Figure 5A clearly shows that the strain caused by the stress is mostly concentrated on the bottom part of the support seat, so when the opening of the lamp tube support structure is stretched by the lamp tube, the deformation is concentrated on the bottom part of the support seat to cause excessive deformation. The plastic strain of the supporting structure has been greatly reduced, resulting in insufficient clamping force of the subsequent lamp tube.

In contrast, the stress distribution of the present invention shown in FIG. 5B is more uniformly dispersed in other parts of the cantilever. Therefore, the lamp tube support structure 10 disclosed in the present invention can more elastically withstand the stress deformation encountered when assembling the lamp tube, and avoid the problem of permanent deformation due to excessive stress concentration.

In addition, in order to effectively reduce the assembly resistance when assembling the lamp tube, each cantilever 30 of the present invention further includes two guide parts 60 (please refer to FIG. 3 ), which respectively extend upward from the top 301 of the cantilever to form a shape similar to a funnel. , the lamp tube 200 can be smoothly introduced into the accommodating space 120 through the opening 140 . The design of the guide part 60 can effectively reduce the assembly resistance encountered when assembling the lamp tube in the backlight module. Therefore, in conjunction with the above-mentioned cantilever of the present invention with an appropriate proportion of cross-sectional changes, the present invention can provide less assembly resistance and a more even stress distribution. , Lamp support structure with large clamping force.

For example, in the results of an actual test, it was shown that the lamp tube support structure of the prior art suffers a lamp tube push-in resistance of 10.5 Newtons when the lamp tube is pushed in, and it is necessary to forcibly pull out the lamp tube assembled in the support structure. The pull-out force (that is, the reaction force of the clamping force of the support structure of the lamp tube) is 7.2 Newtons. However, the lamp tube supporting structure of the present invention can provide a lamp tube pushing resistance of 7.7 Newtons and a lamp tube pulling force of 8.4 Newtons. Comparing the two, it can be clearly found that when the lamp tube is combined with the lamp tube support structure of the present invention, the push-in resistance of the lamp tube is relatively small, and once the lamp tube is assembled on the support structure, the lamp tube of the present invention However, the clamping force of the supporting structure is relatively improved, that is, better clamping force of the lamp tube is provided, and the problem of unintended lamp tube jumping described in the prior art is avoided.

It should be noted that the light tube support structure disclosed above is only an example, and those skilled in the art can apply the content of the present invention to different support structure shapes according to actual needs. For example, referring to Fig. 6, another embodiment of the lamp tube supporting structure of the present invention is shown in the figure. 20 extends upwards and defines an accommodating space 120 for accommodating the lamp tube 200 . Each upright cantilever 30 further includes a protruding structure 32, and the top 321 of the two protruding structures 32 defines an opening O, so that a lamp tube is suitable to be accommodated in the accommodating space through the opening, and clamp and accommodate the accommodating space. The lamp tube 200 in the accommodating space 120; in addition, the protruding structure 32 of this embodiment also has the same guiding function as the guide part 60 of the foregoing embodiment, and can smoothly guide the lamp tube 200 into the accommodating space through the opening 140 In space 120. Wherein, each upright cantilever 30 has substantially the same characteristics as above, that is, this upright cantilever 30 has a first section 40, and the first section includes a top end region 44 and a bottom end region 42, and the transverse direction of the region The cross-section is gradually reduced from the base to the top area, so as to provide uniform stress distribution and better clamping force. In this embodiment, each upright cantilever 30 also has a second section 50, the second section 50 continues to extend upwards from the top region 44 of the first section 40 of the upright cantilever 30, and the second section 50 also includes A bottom area 52 and a top area 54 . In detail, the bottom region 52 of the second section 50 is adjacent to the top region 44 of the first section 40 . The second section 50 has the same features as the previous embodiments, also having a uniform cross-section.

Taking the rectangular cross-section of the first section 40 of the cantilever 30 as an example, please refer to FIG. The section has a thickness (b) and a width (h). Wherein, the thickness (b) is a maximum distance between front and rear edges on the section, and the width (h) is a maximum distance between the inner edge and the outer edge on any rectangular section. Any two cross-sections (represented by cross-section A and cross-section B) in the first section 40 of this embodiment have the relationship shown in formula 1 and formula 2:

$1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ (Formula 1)

Wherein, h _A in the above formula is the width of section A, and h _B is the width of section B. L _A is the length from section A to the top of the lamp tube support structure. L _B is the length from section B to the top of the lamp tube support structure.

$1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ (Formula 2)

Wherein, b _A is the thickness of the section A, b _B is the thickness of the section B, and the rest have the same definition as the aforementioned formula 1.

The above-mentioned embodiments are only used to illustrate the implementation forms of the present invention and explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or equivalence arrangements that can be easily accomplished by those skilled in the art belong to the scope of the present invention, and the protection scope of the present invention shall be subject to the scope defined in the claims.

Claims (10)

1. A lamp tube support structure used in a backlight module, the lamp tube support structure comprising: a base; and Two cantilevers, each of which extends upwards from the base and defines an accommodating space, and each of which has a top end to define an opening, so that a lamp tube is suitable and can be accommodated in the accommodating space through the opening In the space, a transverse dimension of the opening is smaller than a transverse dimension of the lamp tube; each of the cantilevers has an inner arc edge and an opposite outer arc edge; It is characterized in that each cantilever has: A first section has a top end area and a bottom end area, the bottom end area extends upward from the base, and the cross section of the first section gradually decreases from the base to the top end area; any of the cantilever A section is perpendicular to the longitudinal axis direction C of the lamp tube, any cross section has a width h which is the maximum distance between the inner arc edge and the outer arc edge on any section, and any cross section has a thickness b is the maximum length between the front and rear edges on any section, and any two sections A and B of the cantilever have the following relationship: $1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ formula one $1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ formula two in, h _A is the width of section A, h _B is the width of section B, b _A is the thickness of section A, b _B is the thickness of section B, L _A is the length from section A to the top of the lamp tube support structure, L _B is the length from section B to the top of the lamp tube support structure. 2 . The lamp tube supporting structure as claimed in claim 1 , wherein each of the cantilever arms further comprises a second section extending upwardly from the top end region of the first section to the top end. 3 . 3. The lamp tube supporting structure as claimed in claim 2, wherein the second section of each cantilever has a uniform cross-section. 4. The lamp tube supporting structure as claimed in claim 1, wherein the length of the first section of each cantilever is at least 1/3 of the total length of each cantilever. 5 . The supporting structure for the lamp tube as claimed in claim 1 , further comprising two guiding portions respectively extending upward from the top end of the cantilever so as to smoothly guide the lamp tube into the opening. 6 . 6. The lamp tube support structure according to claim 1, wherein the base has an embedding portion for embedding into a back plate of the backlight module, so that the lamp tube support structure is firmly arranged on the back panel board. 7. A lamp tube support structure used in a backlight module, the lamp tube support structure comprising: Two upright cantilevers, each upright cantilever has a base, each upright cantilever respectively extends upwards from the base, and defines an accommodating space, and each upright cantilever has a protruding structure, and the tops of these protruding structures are used An opening is defined so that a lamp tube can be accommodated in the accommodating space through the opening; each of the cantilever arms has an inner edge and an opposite outer edge; It is characterized in that each cantilever has: A first section has a top end area and a bottom end area, and the cross section of the first section decreases gradually toward the top end area; any section of the cantilever is perpendicular to the longitudinal axis direction C of the lamp tube, any The cross-section has a width h which is the maximum distance between the inner edge and the outer edge on the any section, and any cross-section has a thickness b which is the maximum length between the front and rear edges on the any section, and each of the Any two sections A and B of the cantilever have the following relationship: $1<\frac{h_B}{h_A}<\sqrt{(1+3\frac{L_B-L_A}{L_A})}$ formula one $1<\frac{b_B}{b_A}<1+3\frac{L_B-L_A}{L_A}$ formula two in, h _A is the width of section A, h _B is the width of section B, b _A is the thickness of section A, b _B is the thickness of section B, L _B is the length from section A to the top of the lamp tube support structure, L _B is the length from section B to the top of the lamp tube support structure. 8. The lamp tube support structure according to claim 7, wherein each of the cantilevers further comprises a second section extending upward from the top end of the first section, and the second section also comprises A top area and a bottom area. 9. The lamp tube supporting structure as claimed in claim 8, wherein each second section of the cantilever has a uniform cross-section. 10. The lamp tube supporting structure as claimed in claim 7, wherein the length of the first section of each cantilever is at least 1/3 of the total length of each cantilever.

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